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re_exec()

Execute a regular expression

Synopsis:

#include <unix.h>

int re_exec( char *s );

Arguments:

s

A pointer to the string that you want to compare to the current regular expression. This string must end with a null byte and may include newline characters.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

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This function is in libc.a, but not in libc.so (in order to save space).

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Description:

The re_exec() function compares the string pointed to by the string argument with the last regular expression passed to re_comp().

The re_comp() and re_exec() functions support simple regular expressions. The regular expressions of the form \{m\}, \{m,\}, or \{m,n\} aren't supported.

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For better portability, use regcomp(), regerror(), and regexec() instead of these functions.

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Returns:

1

The string matches the last compiled regular expression.

0

The string doesn't match the last compiled regular expression.

-1

The compiled regular expression is invalid (indicating an internal error).

Classification:

Legacy Unix

Safety:
Cancellation point	No
Interrupt handler	No
Signal handler	Yes
Thread	Yes

See also:

re_comp(), regcomp(), regerror(), regexec()

grep in the Utilities Reference

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