regular expression across some lines Post: 302118851

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LEARN ABOUT NETBSD

re_comp

RE_COMP(3)						   BSD Library Functions Manual 						RE_COMP(3)

NAME

     re_comp, re_exec -- regular expression handler

LIBRARY

     Compatibility Library (libcompat, -lcompat)

SYNOPSIS

     #include <re_comp.h>

     char *
     re_comp(const char *s);

     int
     re_exec(const char *s);

DESCRIPTION

     This interface is made obsolete by regex(3).  It is available from the compatibility library, libcompat.

     The re_comp() function compiles a string into an internal form suitable for pattern matching.  The re_exec() function checks the argument
     string against the last string passed to re_comp().

     The re_comp() function returns 0 if the string s was compiled successfully; otherwise a string containing an error message is returned.  If
     re_comp() is passed 0 or a null string, it returns without changing the currently compiled regular expression.

     The re_exec() function returns 1 if the string s matches the last compiled regular expression, 0 if the string s failed to match the last
     compiled regular expression, and -1 if the compiled regular expression was invalid (indicating an internal error).

     The strings passed to both re_comp() and re_exec() may have trailing or embedded newline characters; they are terminated by NULs.	The regu-
     lar expressions recognized are described in the manual entry for ed(1), given the above difference.

DIAGNOSTICS

     The re_exec() function returns -1 for an internal error.

     The re_comp() function returns one of the following strings if an error occurs:

	   No previous regular expression,
	   Regular expression too long,
	   unmatched (,
	   missing ],
	   too many () pairs,
	   unmatched ).

SEE ALSO

     ed(1), egrep(1), ex(1), fgrep(1), grep(1), regex(3)

HISTORY

     The re_comp() and re_exec() functions appeared in 4.0BSD.

BSD
								   June 4, 1993 							       BSD

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

regular expression grepping lines with VARIOUS number of blanks

Discussion started by: ABE2202

2. Shell Programming and Scripting

sed not printing lines before a regular expression.

Discussion started by: Livio

3. Shell Programming and Scripting

Integer expression expected: with regular expression

Discussion started by: ketkee1985

4. Shell Programming and Scripting

Would like to print 3 lines after a regular expression is found in the logfile

Discussion started by: joachimshaun