HP-UX Reference (11i v2 04/09) - 3 Library Functions N-Z (vol 7)

regexp(3X) regexp(3X)

advance() breaks out of the loop that backs up and returns zero. This is used by ed(1) and sed(1) for

substitutions done globally (not just the ﬁrst occurrence, but the whole line) so, for example, expressions

such as

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

The additional external variables

sed and nbra are used for special purposes.

EXTERNAL INFLUENCES

Environment Variables

LC_COLLATE 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();