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regexp.h is part of UNIX. :) So not a bad question. The manual page is a good start, see man regcomp. Also here is a short example.

#include <stdio.h>
#include <regex.h>
int main(void)
{
...

regular expressions are not part of Standard C, you might find some
libraries for it. All i can suggest is searching for PCRE might give you something .

Hi.

There is more than one way to interpret your question; methyl and vbe have one, here's another:
SYNOPSIS
timeout [OPTION] NUMBER[SUFFIX] COMMAND [ARG]...
timeout [OPTION]
...

Consider what would happen if you had the following 6 crons:
/path_to_script/scriptname
sleep 10;/path_to_script/scriptname
sleep 20;/path_to_script/scriptname
sleep 30;/path_to_script/scriptname...

Are you sure?

Please post what Operating System and version you have and what Shell you are using.
Also, please post what problem you are trying to solve.

Use a while loop with a sleep of 10...