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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.

-