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T-Rex a tiny regular expression library optimized for use on AVR microcontrollers

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TINY-REX https://github.com/omtinez/tiny-rex
--------------------------------------------

Tiny-Rex a tiny regular expression library.

This library has been optimized for smaller footprint and binary
size compared to the original author's work. For AVR microcontroller
binary format, the binary size is under 8K.

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)`

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.
	
----------------------------------------------------------------------

`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 expression 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 performed.

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