@@ -0,0 +1,15 @@ 
+===version 1.3
+-fixed a bug for GCC users(thx Brendan)
+
+===version 1.2
+-added word boundary match \b and \B
+-added vertical tab escape \v
+-\w now also matches '_' (underscore)
+-fixed greediness for * and +
+
+===version 1.1 , April 1, 2004
+-fixed some minor bug
+-added predefined character classes(\w,\W,\s,\S etc...)
+
+===version 1.0 , February 23, 2004
+-first public realase

@@ -0,0 +1,652 @@ 
+/* see copyright notice in trex.h */
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <setjmp.h>
+#include "trex.h"
+
+#ifdef _UINCODE
+#define scisprint iswprint
+#define scstrlen wcslen
+#define scprintf wprintf
+#define _SC(x) L(x)
+#else
+#define scisprint isprint
+#define scstrlen strlen
+#define scprintf printf
+#define _SC(x) (x)
+#endif
+
+#ifdef _DEBUG
+#include <stdio.h>
+
+static const TRexChar *g_nnames[] =
+{
+	_SC("NONE"),_SC("OP_GREEDY"),	_SC("OP_OR"),
+	_SC("OP_EXPR"),_SC("OP_NOCAPEXPR"),_SC("OP_DOT"),	_SC("OP_CLASS"),
+	_SC("OP_CCLASS"),_SC("OP_NCLASS"),_SC("OP_RANGE"),_SC("OP_CHAR"),
+	_SC("OP_EOL"),_SC("OP_BOL"),_SC("OP_WB")
+};
+
+#endif
+#define OP_GREEDY		(MAX_CHAR+1) // * + ? {n}
+#define OP_OR			(MAX_CHAR+2)
+#define OP_EXPR			(MAX_CHAR+3) //parentesis ()
+#define OP_NOCAPEXPR	(MAX_CHAR+4) //parentesis (?:)
+#define OP_DOT			(MAX_CHAR+5)
+#define OP_CLASS		(MAX_CHAR+6)
+#define OP_CCLASS		(MAX_CHAR+7)
+#define OP_NCLASS		(MAX_CHAR+8) //negates class the [^
+#define OP_RANGE		(MAX_CHAR+9)
+#define OP_CHAR			(MAX_CHAR+10)
+#define OP_EOL			(MAX_CHAR+11)
+#define OP_BOL			(MAX_CHAR+12)
+#define OP_WB			(MAX_CHAR+13)
+
+#define TREX_SYMBOL_ANY_CHAR ('.')
+#define TREX_SYMBOL_GREEDY_ONE_OR_MORE ('+')
+#define TREX_SYMBOL_GREEDY_ZERO_OR_MORE ('*')
+#define TREX_SYMBOL_GREEDY_ZERO_OR_ONE ('?')
+#define TREX_SYMBOL_BRANCH ('|')
+#define TREX_SYMBOL_END_OF_STRING ('$')
+#define TREX_SYMBOL_BEGINNING_OF_STRING ('^')
+#define TREX_SYMBOL_ESCAPE_CHAR ('\\')
+
+
+typedef int TRexNodeType;
+
+typedef struct tagTRexNode{
+	TRexNodeType type;
+	int left;
+	int right;
+	int next;
+}TRexNode;
+
+struct TRex{
+	const TRexChar *_eol;
+	const TRexChar *_bol;
+	const TRexChar *_p;
+	int _first;
+	int _op;
+	TRexNode *_nodes;
+	int _nallocated;
+	int _nsize;
+	int _nsubexpr;
+	TRexMatch *_matches;
+	int _currsubexp;
+	void *_jmpbuf;
+	const TRexChar **_error;
+};
+
+static int trex_list(TRex *exp);
+
+static int trex_newnode(TRex *exp, TRexNodeType type)
+{
+	TRexNode n;
+	int newid;
+	n.type = type;
+	n.next = n.right = n.left = -1;
+	if(type == OP_EXPR)
+		n.right = exp->_nsubexpr++;
+	if(exp->_nallocated < (exp->_nsize + 1)) {
+		int oldsize = exp->_nallocated;
+		exp->_nallocated *= 2;
+		exp->_nodes = (TRexNode *)realloc(exp->_nodes, exp->_nallocated * sizeof(TRexNode));
+	}
+	exp->_nodes[exp->_nsize++] = n;
+	newid = exp->_nsize - 1;
+	return (int)newid;
+}
+
+static void trex_error(TRex *exp,const TRexChar *error)
+{
+	if(exp->_error) *exp->_error = error;
+	longjmp(*((jmp_buf*)exp->_jmpbuf),-1);
+}
+
+static void trex_expect(TRex *exp, int n){
+	if((*exp->_p) != n)
+		trex_error(exp, _SC("expected paren"));
+	exp->_p++;
+}
+
+static TRexChar trex_escapechar(TRex *exp)
+{
+	if(*exp->_p == TREX_SYMBOL_ESCAPE_CHAR){
+		exp->_p++;
+		switch(*exp->_p) {
+		case 'v': exp->_p++; return '\v';
+		case 'n': exp->_p++; return '\n';
+		case 't': exp->_p++; return '\t';
+		case 'r': exp->_p++; return '\r';
+		case 'f': exp->_p++; return '\f';
+		default: return (*exp->_p++);
+		}
+	} else if(!scisprint(*exp->_p)) trex_error(exp,_SC("letter expected"));
+	return (*exp->_p++);
+}
+
+static int trex_charclass(TRex *exp,int classid)
+{
+	int n = trex_newnode(exp,OP_CCLASS);
+	exp->_nodes[n].left = classid;
+	return n;
+}
+
+static int trex_charnode(TRex *exp,TRexBool isclass)
+{
+	TRexChar t;
+	if(*exp->_p == TREX_SYMBOL_ESCAPE_CHAR) {
+		exp->_p++;
+		switch(*exp->_p) {
+			case 'n': exp->_p++; return trex_newnode(exp,'\n');
+			case 't': exp->_p++; return trex_newnode(exp,'\t');
+			case 'r': exp->_p++; return trex_newnode(exp,'\r');
+			case 'f': exp->_p++; return trex_newnode(exp,'\f');
+			case 'v': exp->_p++; return trex_newnode(exp,'\v');
+			case 'a': case 'A': case 'w': case 'W': case 's': case 'S':
+			case 'd': case 'D': case 'x': case 'X': case 'c': case 'C':
+			case 'p': case 'P': case 'l': case 'u':
+				{
+				t = *exp->_p; exp->_p++;
+				return trex_charclass(exp,t);
+				}
+			case 'b':
+			case 'B':
+				if(!isclass) {
+					int node = trex_newnode(exp,OP_WB);
+					exp->_nodes[node].left = *exp->_p;
+					exp->_p++;
+					return node;
+				} //else default
+			default:
+				t = *exp->_p; exp->_p++;
+				return trex_newnode(exp,t);
+		}
+	}
+	else if(!scisprint(*exp->_p)) {
+
+		trex_error(exp,_SC("letter expected"));
+	}
+	t = *exp->_p; exp->_p++;
+	return trex_newnode(exp,t);
+}
+static int trex_class(TRex *exp)
+{
+	int ret = -1;
+	int first = -1,chain;
+	if(*exp->_p == TREX_SYMBOL_BEGINNING_OF_STRING){
+		ret = trex_newnode(exp,OP_NCLASS);
+		exp->_p++;
+	}else ret = trex_newnode(exp,OP_CLASS);
+
+	if(*exp->_p == ']') trex_error(exp,_SC("empty class"));
+	chain = ret;
+	while(*exp->_p != ']' && exp->_p != exp->_eol) {
+		if(*exp->_p == '-' && first != -1){
+			int r,t;
+			if(*exp->_p++ == ']') trex_error(exp,_SC("unfinished range"));
+			r = trex_newnode(exp,OP_RANGE);
+			if(first>*exp->_p) trex_error(exp,_SC("invalid range"));
+			if(exp->_nodes[first].type == OP_CCLASS) trex_error(exp,_SC("cannot use character classes in ranges"));
+			exp->_nodes[r].left = exp->_nodes[first].type;
+			t = trex_escapechar(exp);
+			exp->_nodes[r].right = t;
+            exp->_nodes[chain].next = r;
+			chain = r;
+			first = -1;
+		}
+		else{
+			if(first!=-1){
+				int c = first;
+				exp->_nodes[chain].next = c;
+				chain = c;
+				first = trex_charnode(exp,TRex_True);
+			}
+			else{
+				first = trex_charnode(exp,TRex_True);
+			}
+		}
+	}
+	if(first!=-1){
+		int c = first;
+		exp->_nodes[chain].next = c;
+		chain = c;
+		first = -1;
+	}
+	/* hack? */
+	exp->_nodes[ret].left = exp->_nodes[ret].next;
+	exp->_nodes[ret].next = -1;
+	return ret;
+}
+
+static int trex_parsenumber(TRex *exp)
+{
+	int ret = *exp->_p-'0';
+	int positions = 10;
+	exp->_p++;
+	while(isdigit(*exp->_p)) {
+		ret = ret*10+(*exp->_p++-'0');
+		if(positions==1000000000) trex_error(exp,_SC("overflow in numeric constant"));
+		positions *= 10;
+	};
+	return ret;
+}
+
+static int trex_element(TRex *exp)
+{
+	int ret = -1;
+	switch(*exp->_p)
+	{
+	case '(': {
+		int expr,newn;
+		exp->_p++;
+
+
+		if(*exp->_p =='?') {
+			exp->_p++;
+			trex_expect(exp,':');
+			expr = trex_newnode(exp,OP_NOCAPEXPR);
+		}
+		else
+			expr = trex_newnode(exp,OP_EXPR);
+		newn = trex_list(exp);
+		exp->_nodes[expr].left = newn;
+		ret = expr;
+		trex_expect(exp,')');
+			  }
+			  break;
+	case '[':
+		exp->_p++;
+		ret = trex_class(exp);
+		trex_expect(exp,']');
+		break;
+	case TREX_SYMBOL_END_OF_STRING: exp->_p++; ret = trex_newnode(exp,OP_EOL);break;
+	case TREX_SYMBOL_ANY_CHAR: exp->_p++; ret = trex_newnode(exp,OP_DOT);break;
+	default:
+		ret = trex_charnode(exp,TRex_False);
+		break;
+	}
+
+	{
+		int op;
+		TRexBool isgreedy = TRex_False;
+		unsigned short p0 = 0, p1 = 0;
+		switch(*exp->_p){
+			case TREX_SYMBOL_GREEDY_ZERO_OR_MORE: p0 = 0; p1 = 0xFFFF; exp->_p++; isgreedy = TRex_True; break;
+			case TREX_SYMBOL_GREEDY_ONE_OR_MORE: p0 = 1; p1 = 0xFFFF; exp->_p++; isgreedy = TRex_True; break;
+			case TREX_SYMBOL_GREEDY_ZERO_OR_ONE: p0 = 0; p1 = 1; exp->_p++; isgreedy = TRex_True; break;
+			case '{':
+				exp->_p++;
+				if(!isdigit(*exp->_p)) trex_error(exp,_SC("number expected"));
+				p0 = (unsigned short)trex_parsenumber(exp);
+				/*******************************/
+				switch(*exp->_p) {
+			case '}':
+				p1 = p0; exp->_p++;
+				break;
+			case ',':
+				exp->_p++;
+				p1 = 0xFFFF;
+				if(isdigit(*exp->_p)){
+					p1 = (unsigned short)trex_parsenumber(exp);
+				}
+				trex_expect(exp,'}');
+				break;
+			default:
+				trex_error(exp,_SC(", or } expected"));
+		}
+		/*******************************/
+		isgreedy = TRex_True;
+		break;
+
+		}
+		if(isgreedy) {
+			int nnode = trex_newnode(exp,OP_GREEDY);
+			op = OP_GREEDY;
+			exp->_nodes[nnode].left = ret;
+			exp->_nodes[nnode].right = ((p0)<<16)|p1;
+			ret = nnode;
+		}
+	}
+	if((*exp->_p != TREX_SYMBOL_BRANCH) && (*exp->_p != ')') && (*exp->_p != TREX_SYMBOL_GREEDY_ZERO_OR_MORE) && (*exp->_p != TREX_SYMBOL_GREEDY_ONE_OR_MORE) && (*exp->_p != '\0')) {
+		int nnode = trex_element(exp);
+		exp->_nodes[ret].next = nnode;
+	}
+
+	return ret;
+}
+
+static int trex_list(TRex *exp)
+{
+	int ret=-1,e;
+	if(*exp->_p == TREX_SYMBOL_BEGINNING_OF_STRING) {
+		exp->_p++;
+		ret = trex_newnode(exp,OP_BOL);
+	}
+	e = trex_element(exp);
+	if(ret != -1) {
+		exp->_nodes[ret].next = e;
+	}
+	else ret = e;
+
+	if(*exp->_p == TREX_SYMBOL_BRANCH) {
+		int temp,tright;
+		exp->_p++;
+		temp = trex_newnode(exp,OP_OR);
+		exp->_nodes[temp].left = ret;
+		tright = trex_list(exp);
+		exp->_nodes[temp].right = tright;
+		ret = temp;
+	}
+	return ret;
+}
+
+static TRexBool trex_matchcclass(int cclass,TRexChar c)
+{
+	switch(cclass) {
+	case 'a': return isalpha(c)?TRex_True:TRex_False;
+	case 'A': return !isalpha(c)?TRex_True:TRex_False;
+	case 'w': return (isalnum(c) || c == '_')?TRex_True:TRex_False;
+	case 'W': return (!isalnum(c) && c != '_')?TRex_True:TRex_False;
+	case 's': return isspace(c)?TRex_True:TRex_False;
+	case 'S': return !isspace(c)?TRex_True:TRex_False;
+	case 'd': return isdigit(c)?TRex_True:TRex_False;
+	case 'D': return !isdigit(c)?TRex_True:TRex_False;
+	case 'x': return isxdigit(c)?TRex_True:TRex_False;
+	case 'X': return !isxdigit(c)?TRex_True:TRex_False;
+	case 'c': return iscntrl(c)?TRex_True:TRex_False;
+	case 'C': return !iscntrl(c)?TRex_True:TRex_False;
+	case 'p': return ispunct(c)?TRex_True:TRex_False;
+	case 'P': return !ispunct(c)?TRex_True:TRex_False;
+	case 'l': return islower(c)?TRex_True:TRex_False;
+	case 'u': return isupper(c)?TRex_True:TRex_False;
+	}
+	return TRex_False; /*cannot happen*/
+}
+
+static TRexBool trex_matchclass(TRex* exp,TRexNode *node,TRexChar c)
+{
+	do {
+		switch(node->type) {
+			case OP_RANGE:
+				if(c >= node->left && c <= node->right) return TRex_True;
+				break;
+			case OP_CCLASS:
+				if(trex_matchcclass(node->left,c)) return TRex_True;
+				break;
+			default:
+				if(c == node->type)return TRex_True;
+		}
+	} while((node->next != -1) && (node = &exp->_nodes[node->next]));
+	return TRex_False;
+}
+
+static const TRexChar *trex_matchnode(TRex* exp,TRexNode *node,const TRexChar *str,TRexNode *next)
+{
+
+	TRexNodeType type = node->type;
+	switch(type) {
+	case OP_GREEDY: {
+		//TRexNode *greedystop = (node->next != -1) ? &exp->_nodes[node->next] : NULL;
+		TRexNode *greedystop = NULL;
+		int p0 = (node->right >> 16)&0x0000FFFF, p1 = node->right&0x0000FFFF, nmaches = 0;
+		const TRexChar *s=str, *good = str;
+
+		if(node->next != -1) {
+			greedystop = &exp->_nodes[node->next];
+		}
+		else {
+			greedystop = next;
+		}
+
+		while((nmaches == 0xFFFF || nmaches < p1)) {
+
+			const TRexChar *stop;
+			if(!(s = trex_matchnode(exp,&exp->_nodes[node->left],s,greedystop)))
+				break;
+			nmaches++;
+			good=s;
+			if(greedystop) {
+				//checks that 0 matches satisfy the expression(if so skips)
+				//if not would always stop(for instance if is a '?')
+				if(greedystop->type != OP_GREEDY ||
+				(greedystop->type == OP_GREEDY && ((greedystop->right >> 16)&0x0000FFFF) != 0))
+				{
+					TRexNode *gnext = NULL;
+					if(greedystop->next != -1) {
+						gnext = &exp->_nodes[greedystop->next];
+					}else if(next && next->next != -1){
+						gnext = &exp->_nodes[next->next];
+					}
+					stop = trex_matchnode(exp,greedystop,s,gnext);
+					if(stop) {
+						//if satisfied stop it
+						if(p0 == p1 && p0 == nmaches) break;
+						else if(nmaches >= p0 && p1 == 0xFFFF) break;
+						else if(nmaches >= p0 && nmaches <= p1) break;
+					}
+				}
+			}
+
+			if(s >= exp->_eol)
+				break;
+		}
+		if(p0 == p1 && p0 == nmaches) return good;
+		else if(nmaches >= p0 && p1 == 0xFFFF) return good;
+		else if(nmaches >= p0 && nmaches <= p1) return good;
+		return NULL;
+	}
+	case OP_OR: {
+			const TRexChar *asd = str;
+			TRexNode *temp=&exp->_nodes[node->left];
+			while( (asd = trex_matchnode(exp,temp,asd,NULL)) ) {
+				if(temp->next != -1)
+					temp = &exp->_nodes[temp->next];
+				else
+					return asd;
+			}
+			asd = str;
+			temp = &exp->_nodes[node->right];
+			while( (asd = trex_matchnode(exp,temp,asd,NULL)) ) {
+				if(temp->next != -1)
+					temp = &exp->_nodes[temp->next];
+				else
+					return asd;
+			}
+			return NULL;
+			break;
+	}
+	case OP_EXPR:
+	case OP_NOCAPEXPR:{
+			TRexNode *n = &exp->_nodes[node->left];
+			const TRexChar *cur = str;
+			int capture = -1;
+			if(node->type != OP_NOCAPEXPR && node->right == exp->_currsubexp) {
+				capture = exp->_currsubexp;
+				exp->_matches[capture].begin = cur;
+				exp->_currsubexp++;
+			}
+
+			do {
+				TRexNode *subnext = NULL;
+				if(n->next != -1) {
+					subnext = &exp->_nodes[n->next];
+				}else {
+					subnext = next;
+				}
+				if(!(cur = trex_matchnode(exp,n,cur,subnext))) {
+					if(capture != -1){
+						exp->_matches[capture].begin = 0;
+						exp->_matches[capture].len = 0;
+					}
+					return NULL;
+				}
+			} while((n->next != -1) && (n = &exp->_nodes[n->next]));
+
+			if(capture != -1)
+				exp->_matches[capture].len = cur - exp->_matches[capture].begin;
+			return cur;
+	}
+	case OP_WB:
+		if(str == exp->_bol && !isspace(*str)
+		 || (str == exp->_eol && !isspace(*(str-1)))
+		 || (!isspace(*str) && isspace(*(str+1)))
+		 || (isspace(*str) && !isspace(*(str+1))) ) {
+			return (node->left == 'b')?str:NULL;
+		}
+		return (node->left == 'b')?NULL:str;
+	case OP_BOL:
+		if(str == exp->_bol) return str;
+		return NULL;
+	case OP_EOL:
+		if(str == exp->_eol) return str;
+		return NULL;
+	case OP_DOT:{
+		*str++;
+				}
+		return str;
+	case OP_NCLASS:
+	case OP_CLASS:
+		if(trex_matchclass(exp,&exp->_nodes[node->left],*str)?(type == OP_CLASS?TRex_True:TRex_False):(type == OP_NCLASS?TRex_True:TRex_False)) {
+			*str++;
+			return str;
+		}
+		return NULL;
+	case OP_CCLASS:
+		if(trex_matchcclass(node->left,*str)) {
+			*str++;
+			return str;
+		}
+		return NULL;
+	default: /* char */
+		if(*str != node->type) return NULL;
+		*str++;
+		return str;
+	}
+	return NULL;
+}
+
+/* public api */
+TRex *trex_compile(const TRexChar *pattern,const TRexChar **error)
+{
+	TRex *exp = (TRex *)malloc(sizeof(TRex));
+	exp->_eol = exp->_bol = NULL;
+	exp->_p = pattern;
+	exp->_nallocated = (int)scstrlen(pattern) * sizeof(TRexChar);
+	exp->_nodes = (TRexNode *)malloc(exp->_nallocated * sizeof(TRexNode));
+	exp->_nsize = 0;
+	exp->_matches = 0;
+	exp->_nsubexpr = 0;
+	exp->_first = trex_newnode(exp,OP_EXPR);
+	exp->_error = error;
+	exp->_jmpbuf = malloc(sizeof(jmp_buf));
+	if(setjmp(*((jmp_buf*)exp->_jmpbuf)) == 0) {
+		int res = trex_list(exp);
+		exp->_nodes[exp->_first].left = res;
+		if(*exp->_p!='\0')
+			trex_error(exp,_SC("unexpected character"));
+#ifdef _DEBUG
+		{
+			int nsize,i;
+			TRexNode *t;
+			nsize = exp->_nsize;
+			t = &exp->_nodes[0];
+			scprintf(_SC("\n"));
+			for(i = 0;i < nsize; i++) {
+				if(exp->_nodes[i].type>MAX_CHAR)
+					scprintf(_SC("[%02d] %10s "),i,g_nnames[exp->_nodes[i].type-MAX_CHAR]);
+				else
+					scprintf(_SC("[%02d] %10c "),i,exp->_nodes[i].type);
+				scprintf(_SC("left %02d right %02d next %02d\n"),exp->_nodes[i].left,exp->_nodes[i].right,exp->_nodes[i].next);
+			}
+			scprintf(_SC("\n"));
+		}
+#endif
+		exp->_matches = (TRexMatch *) malloc(exp->_nsubexpr * sizeof(TRexMatch));
+		memset(exp->_matches,0,exp->_nsubexpr * sizeof(TRexMatch));
+	}
+	else{
+		trex_free(exp);
+		return NULL;
+	}
+	return exp;
+}
+
+void trex_free(TRex *exp)
+{
+	if(exp)	{
+		if(exp->_nodes) free(exp->_nodes);
+		if(exp->_jmpbuf) free(exp->_jmpbuf);
+		if(exp->_matches) free(exp->_matches);
+		free(exp);
+	}
+}
+
+TRexBool trex_match(TRex* exp,const TRexChar* text)
+{
+	const TRexChar* res = NULL;
+	exp->_bol = text;
+	exp->_eol = text + scstrlen(text);
+	exp->_currsubexp = 0;
+	res = trex_matchnode(exp,exp->_nodes,text,NULL);
+
+	#ifdef _DEBUG
+		scprintf("DEBUG trex_match: res = '%s'\n", res);
+		scprintf("DEBUG trex_match: exp->_eol = '%s'\n", exp->_eol);
+	#endif
+
+	// Fail match if trex_matchnode returns nothing
+	if (!res) {
+		return TRex_False;
+	}
+
+	return TRex_True;
+}
+
+TRexBool trex_searchrange(TRex* exp,const TRexChar* text_begin,const TRexChar* text_end,const TRexChar** out_begin, const TRexChar** out_end)
+{
+	const TRexChar *cur = NULL;
+	int node = exp->_first;
+	if(text_begin >= text_end) return TRex_False;
+	exp->_bol = text_begin;
+	exp->_eol = text_end;
+	do {
+		cur = text_begin;
+		while(node != -1) {
+			exp->_currsubexp = 0;
+			cur = trex_matchnode(exp,&exp->_nodes[node],cur,NULL);
+			if(!cur)
+				break;
+			node = exp->_nodes[node].next;
+		}
+		*text_begin++;
+	} while(cur == NULL && text_begin != text_end);
+
+	if(cur == NULL)
+		return TRex_False;
+
+	--text_begin;
+
+	if(out_begin) *out_begin = text_begin;
+	if(out_end) *out_end = cur;
+	return TRex_True;
+}
+
+TRexBool trex_search(TRex* exp,const TRexChar* text, const TRexChar** out_begin, const TRexChar** out_end)
+{
+	return trex_searchrange(exp,text,text + scstrlen(text),out_begin,out_end);
+}
+
+int trex_getsubexpcount(TRex* exp)
+{
+	return exp->_nsubexpr;
+}
+
+TRexBool trex_getsubexp(TRex* exp, int n, TRexMatch *subexp)
+{
+	if( n<0 || n >= exp->_nsubexpr) return TRex_False;
+	*subexp = exp->_matches[n];
+	return TRex_True;
+}
+

@@ -0,0 +1,171 @@ 
+T-REX 1.3 http://tiny-rex.sourceforge.net
+----------------------------------------------------------------------
+	T-Rex a tiny regular expression library
+
+	Copyright (C) 2003-2006 Alberto Demichelis
+
+	This software is provided 'as-is', without any express 
+	or implied warranty. In no event will the authors be held 
+	liable for any damages arising from the use of this software.
+
+	Permission is granted to anyone to use this software for 
+	any purpose, including commercial applications, and to alter
+	it and redistribute it freely, subject to the following restrictions:
+
+		1. The origin of this software must not be misrepresented;
+		you must not claim that you wrote the original software.
+		If you use this software in a product, an acknowledgment
+		in the product documentation would be appreciated but
+		is not required.
+
+		2. Altered source versions must be plainly marked as such,
+		and must not be misrepresented as being the original software.
+
+		3. This notice may not be removed or altered from any
+		source distribution.
+		
+----------------------------------------------------------------------
+TRex implements the following expressions
+
+\	Quote the next metacharacter
+^	Match the beginning of the string
+.	Match any character
+$	Match the end of the string
+|	Alternation
+()	Grouping (creates a capture)
+[]	Character class  
+
+==GREEDY CLOSURES==
+*	   Match 0 or more times
++	   Match 1 or more times
+?	   Match 1 or 0 times
+{n}    Match exactly n times
+{n,}   Match at least n times
+{n,m}  Match at least n but not more than m times  
+
+==ESCAPE CHARACTERS==
+\t		tab                   (HT, TAB)
+\n		newline               (LF, NL)
+\r		return                (CR)
+\f		form feed             (FF)
+
+==PREDEFINED CLASSES==
+\l		lowercase next char
+\u		uppercase next char
+\a		letters
+\A		non letters
+\w		alphanimeric [0-9a-zA-Z]
+\W		non alphanimeric
+\s		space
+\S		non space
+\d		digits
+\D		non nondigits
+\x		exadecimal digits
+\X		non exadecimal digits
+\c		control charactrs
+\C		non control charactrs
+\p		punctation
+\P		non punctation
+\b		word boundary
+\B		non word boundary
+
+----------------------------------------------------------------------
+API DOC
+----------------------------------------------------------------------
+TRex *trex_compile(const TRexChar *pattern,const TRexChar **error);
+
+compiles an expression and returns a pointer to the compiled version.
+in case of failure returns NULL.The returned object has to be deleted
+through the function trex_free().
+
+pattern
+	a pointer to a zero terminated string containing the pattern that 
+	has to be compiled.
+error
+	apointer to a string pointer that will be set with an error string
+	in case of failure.
+	
+----------------------------------------------------------------------
+void trex_free(TRex *exp)
+
+deletes a expression structure created with trex_compile()
+
+exp
+	the expression structure that has to be deleted
+
+----------------------------------------------------------------------
+TRexBool trex_match(TRex* exp,const TRexChar* text)
+
+returns TRex_True if the string specified in the parameter text is an
+exact match of the expression, otherwise returns TRex_False.
+
+exp
+	the compiled expression
+text
+	the string that has to be tested
+	
+----------------------------------------------------------------------
+TRexBool trex_search(TRex* exp,const TRexChar* text, const TRexChar** out_begin, const TRexChar** out_end)
+
+searches the first match of the expressin in the string specified in the parameter text.
+if the match is found returns TRex_True and the sets out_begin to the beginning of the
+match and out_end at the end of the match; otherwise returns TRex_False.
+
+exp
+	the compiled expression
+text
+	the string that has to be tested
+out_begin
+	a pointer to a string pointer that will be set with the beginning of the match
+out_end
+	a pointer to a string pointer that will be set with the end of the match
+
+----------------------------------------------------------------------
+TREX_API TRexBool trex_searchrange(TRex* exp,const TRexChar* text_begin,const TRexChar* text_end,const TRexChar** out_begin, const TRexChar** out_end)
+
+searches the first match of the expressin in the string delimited 
+by the parameter text_begin and text_end.
+if the match is found returns TRex_True and the sets out_begin to the beginning of the
+match and out_end at the end of the match; otherwise returns TRex_False.
+
+exp
+	the compiled expression
+text_begin
+	a pointer to the beginnning of the string that has to be tested
+text_end
+	a pointer to the end of the string that has to be tested
+out_begin
+	a pointer to a string pointer that will be set with the beginning of the match
+out_end
+	a pointer to a string pointer that will be set with the end of the match
+	
+----------------------------------------------------------------------
+int trex_getsubexpcount(TRex* exp)
+
+returns the number of sub expressions matched by the expression
+
+exp
+	the compiled expression
+
+---------------------------------------------------------------------
+TRexBool trex_getsubexp(TRex* exp, int n, TRexMatch *submatch)
+
+retrieve the begin and and pointer to the length of the sub expression indexed
+by n. The result is passed trhough the struct TRexMatch:
+
+typedef struct {
+	const TRexChar *begin;
+	int len;
+} TRexMatch;
+
+the function returns TRex_True if n is valid index otherwise TRex_False.
+
+exp
+	the compiled expression
+n
+	the index of the submatch
+submatch
+	a pointer to structure that will store the result
+	
+this function works also after a match operation has been performend.
+	

@@ -0,0 +1,67 @@ 
+#ifndef _TREX_H_
+#define _TREX_H_
+/***************************************************************
+	T-Rex a tiny regular expression library
+
+	Copyright (C) 2003-2006 Alberto Demichelis
+
+	This software is provided 'as-is', without any express 
+	or implied warranty. In no event will the authors be held 
+	liable for any damages arising from the use of this software.
+
+	Permission is granted to anyone to use this software for 
+	any purpose, including commercial applications, and to alter
+	it and redistribute it freely, subject to the following restrictions:
+
+		1. The origin of this software must not be misrepresented;
+		you must not claim that you wrote the original software.
+		If you use this software in a product, an acknowledgment
+		in the product documentation would be appreciated but
+		is not required.
+
+		2. Altered source versions must be plainly marked as such,
+		and must not be misrepresented as being the original software.
+
+		3. This notice may not be removed or altered from any
+		source distribution.
+
+****************************************************************/
+
+//#ifdef _UNICODE
+//#define TRexChar unsigned short
+//#define MAX_CHAR 0xFFFF
+//#define _TREXC(c) L##c 
+//#define trex_strlen wcslen
+//#define trex_printf wprintf
+//#else
+#define TRexChar char
+#define MAX_CHAR 0xFF
+#define _TREXC(c) (c) 
+#define trex_strlen strlen
+#define trex_printf printf
+//#endif
+
+#ifndef extern
+#define extern extern
+#endif
+
+#define TRex_True 1
+#define TRex_False 0
+
+typedef unsigned int TRexBool;
+typedef struct TRex TRex;
+
+typedef struct {
+	const TRexChar *begin;
+	int len;
+} TRexMatch;
+
+extern TRex *trex_compile(const TRexChar *pattern,const TRexChar **error);
+extern void trex_free(TRex *exp);
+extern TRexBool trex_match(TRex* exp,const TRexChar* text);
+extern TRexBool trex_search(TRex* exp,const TRexChar* text, const TRexChar** out_begin, const TRexChar** out_end);
+extern TRexBool trex_searchrange(TRex* exp,const TRexChar* text_begin,const TRexChar* text_end,const TRexChar** out_begin, const TRexChar** out_end);
+extern int trex_getsubexpcount(TRex* exp);
+extern TRexBool trex_getsubexp(TRex* exp, int n, TRexMatch *subexp);
+
+#endif

@@ -1,5 +1,5 @@ 
 import tables, strutils, os, osproc, times
-import parser, interpreter, utils
+import parser, interpreter, utils, trex
 
 minsym "exit":
   quit(0)

@@ -0,0 +1,64 @@ 
+{.compile: "T-Rex/libtrex.c".}
+{.push importc.}
+when not(defined(TREX_H)): 
+  const 
+    TREX_H* = true
+  #**************************************************************
+  # T-Rex a tiny regular expression library
+  #
+  # Copyright (C) 2003-2006 Alberto Demichelis
+  #
+  # This software is provided 'as-is', without any express 
+  # or implied warranty. In no event will the authors be held 
+  # liable for any damages arising from the use of this software.
+  #
+  # Permission is granted to anyone to use this software for 
+  # any purpose, including commercial applications, and to alter
+  # it and redistribute it freely, subject to the following restrictions:
+  #
+  #  1. The origin of this software must not be misrepresented;
+  #  you must not claim that you wrote the original software.
+  #  If you use this software in a product, an acknowledgment
+  #  in the product documentation would be appreciated but
+  #  is not required.
+  #
+  #  2. Altered source versions must be plainly marked as such,
+  #  and must not be misrepresented as being the original software.
+  #
+  #  3. This notice may not be removed or altered from any
+  #  source distribution.
+  #
+  #**************************************************************
+  ##ifdef _UNICODE
+  ##define TRexChar unsigned short
+  ##define MAX_CHAR 0xFFFF
+  ##define _TREXC(c) L##c 
+  ##define trex_strlen wcslen
+  ##define trex_printf wprintf
+  ##else
+  type
+    TRexChar* = char
+    TRex* = object
+  const 
+    MAX_CHAR* = 0x000000FF
+
+  ##endif
+  const 
+    TRex_True* = 1
+    TRex_False* = 0
+  type 
+    TRexBool* = cuint
+    TRexMatch* = object 
+      begin*: ptr TRexChar
+      len*: cint
+
+  proc compile*(pattern: ptr TRexChar; error: ptr ptr TRexChar): ptr TRex
+  proc free*(exp: ptr TRex)
+  proc match*(exp: ptr TRex; text: ptr TRexChar): TRexBool
+  proc search*(exp: ptr TRex; text: ptr TRexChar; 
+                    out_begin: ptr ptr TRexChar; out_end: ptr ptr TRexChar): TRexBool
+  proc searchrange*(exp: ptr TRex; text_begin: ptr TRexChar; 
+                         text_end: ptr TRexChar; out_begin: ptr ptr TRexChar; 
+                         out_end: ptr ptr TRexChar): TRexBool
+  proc getsubexpcount*(exp: ptr TRex): cint
+  proc getsubexp*(exp: ptr TRex; n: cint; subexp: ptr TRexMatch): TRexBool