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-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.
-