IRREGular EXpression

Regex expression matcher in c for the subset of conventional regex.

Syntax

Expression	Match clause
c	matches any literal character c
.	matches any single character
^	matches the beginning of the input string
$	matches the end of the input string
c*	matches zero or more occurrences of the character c
.*c	matches zero or more of any character until c
.*\0	matches zero or more of any character until the end of input string
*c	matches zero or more of any character until c from the start of input string

Quick Start

make
make test

Examples

irregex "Hello .* " "Hello nosferatu Hello ninthcircle"
> Hello nosferatu

irregex "ir*e.ex" "irrrrrregex"
> irrrrrregex

References

• A Regular Expression Matcher - Brian Kernighan