regexp.3x (2010 09)

regexp(3X) regexp(3X)

such as s/y*//g do not loop forever.

The additional external variables

sed and nbra are used for special purposes.

EXTERNAL INFLUENCES

Locale

The

LC_COLLATE category determines the collating sequence used in compiling and executing regular

expressions.

The

LC_CTYPE category determines the interpretation of text as single and/or multi-byte characters,

and the characters matched by character class expressions in regular expressions.

International Code Set Support

Single- and multi-byte character code sets are supported.

EXAMPLES

The following is an example of how the regular expression macros and calls look from grep (1):

#define INIT register char *sp = instring;

#define GETC() (*sp++)

#define PEEKC() (*sp)

#define UNGETC(c) (--sp)

#define RETURN(c) return;

#define ERROR(c) regerr()

#include <regexp.h>

...

(void) compile(*argv, expbuf, &expbuf[ESIZE], ’\0’);

...

if (step(linebuf, expbuf))

succeed();