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Man Pages


Manual Reference Pages  -  RE_COMP (3)

NAME

re_comp, re_exec - regular expression handler

CONTENTS

Library
Synopsis
Description
Diagnostics
See Also
History

LIBRARY


.Lb libcompat

SYNOPSIS


.In unistd.h char * re_comp const char *s int re_exec const char *s

DESCRIPTION


.Bf -symbolic This interface is made obsolete by regex(3).
.Ef

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 NUL s. The regular 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 "no previous regular expression" or one of the strings generated by regerror(3).

SEE ALSO

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

HISTORY

The re_comp and re_exec functions appeared in BSD 4.0 .
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