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sf_sed(3)		 BSD Library Functions Manual		     sf_sed(3)

NAME
     sed_compile, sed_exec, sed_free --	string editor

SYNOPSIS
     #include <strfunc.h>

     sed_t *
     sed_compile(char *expr);

     char *
     sed_exec(sed_t *se, char *string);

     svect *
     sed_results(sed_t *se);

     void
     sed_free(sed_t *se);

DESCRIPTION
     These routines implement a	subset of sed(1) or Perl's s///, y/// and //
     functionality.

     You must compule your expression with sed_compile() in order to evaluate
     it	later.	Once compiled, it can be evaluated multiple times. See the EX-
     PRESSIONS block to	know about expressions semantics.

     sed_free()	used to	destroy	the compiled structure and free	the allocated
     memory.

     sed_exec()	takes the source string	and transforms it according to the
     compiled rules.  Resulting	string stored in the internal buffer within
     the specified sed_t structure.

     sed_results() May be invoked multiple times after sed_exec() to obtain
     last match	results. An 'r'	flag should be specified within	the expression
     string.

EXPRESSIONS
     Currently,	this library supports two types	of string transformations and
     one type of string	match.

     Substitutions

     Expressions of this type are defined in the following BNF:

	   <delim> :=	   '/' | <other_character>

	   <regex> :=	   <regular_expression,	re_format(7)>

	   <to>	   :=	   <string>

	   <flags> :=	   *( 'g' | 'i'	| 'e' |	'r' | 'm' | 'n'	)

	   <expr>  :=	   s <delim> <regex> <delim> <to> <delim> <flags>

     Refer to sed(1) manual page to know other details.

     Table lookup

	   <delim> :=	   '/' | <other_character>

	   <flags> :=	   *( 'i' )

	   <expr>  :=	   y <delim> <string> <delim> <string> <delim> <flags>

     String match

	   <delim> :=	   '/' | <other_character>

	   <flags> :=	   *( 'i' | 'r'	| 'm' |	'n' )

	   <reply> :=	   <string>

	   <expr>  :=	   <delim> <string> <delim> [ <reply> <delim>] <flags>

     In	the last case, if string does not match, sed_exec() will return	a NULL
     pointer, <reply> otherwise. s/// and y/// functions will never return a
     NULL pointer.

	   Flags are common to those transformations.

	   'i'	   case-insensitive matches.

	   'e'	   compile in extended mode (REG_EXTENDED).

	   'g'	   Make	the substitution for all non-overlapping matches of
		   the regular expression, not just the	first one.

	   'r'	   Remember last match results to allow	use of sed_results().

	   'm'	   Compile for newline-sensitive matching (REG_NEWLINE).

	   'n'	   Don't include zero regexec(3) match (a whole	substring)
		   into	results	list.

EXAMPLE
     void main() {
	     sed_t *se1;
	     sed_t *se2;
	     sed_t *se3;
	     char *r1, *r2, r3;

	     /*	Compile	expressions */
	     se1 = sed_compile("s/(tree) (apple)/\\2 \\1/igr");
	     se2 = sed_compile("y/abc/AbC/i");
	     se3 = sed_compile("/apple/i");

	     r1	= sed_exec(se1,	"Tree Apple");
	     r2	= sed_exec(se2,	"abcabc");
	     r3	= sed_exec(se3,	"another apple tree");

	     /*
	     **	This will produce:
	     **	"Apple Tree\nAbCAbC\n1\n"
	     */
	     printf("%s\n%s\n%d\n", r1,	r2, r3?1:0);

	     /*
	     **	This will produce:
	     **	"[Tree Apple], [Tree], [Apple]\n"
	     */
	     printf("[%s]\n", sjoin(sed_results(se1), "], ["));

	     /*	Free the resources */
	     sed_free(se1);
	     sed_free(se2);
	     sed_free(se3);
     };

SEE ALSO
     strfunc(3).

AUTHORS
     Lev Walkin	<vlm@lionet.info>

BSD			       December	4, 2000				   BSD

NAME | SYNOPSIS | DESCRIPTION | EXPRESSIONS | EXAMPLE | SEE ALSO | AUTHORS

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