Regular Expressions

A small, self-contained regex engine built on the var object model: re_match, re_findall, and re_sub.

#include "abscom/abs.h"

Supported syntax

Token	Meaning
.	Any single character.
*	Zero or more of the preceding element (greedy).
^	Anchor to the start of the input.
$	Anchor to the end of the input.
abc	Literal characters match themselves.

re_findall reports every non-overlapping match. Zero-length matches advance by one character so a search always makes progress, and ^ only matches at the very start of the haystack.

API

Function	Description
bool re_match(var pattern, var text)	True if the whole text matches the pattern.
var re_findall(var pattern, var text)	List of all matched substrings.
var re_sub(var pattern, var repl, var text)	New string with every match replaced.

Pattern, replacement, and text are given as var strings. Non-string inputs are treated as non-matches (returning false or an empty list).

var email = v("admin@abscom.org");

if (re_match(v(".*@.*\\..*"), email)) {
    print(v("Email format valid"));        /* Email format valid */
}

print(re_findall(v("m"), v("mamma")));     /* [m, m] */

print(re_sub(v("o"), v("0"), v("hello"))); /* hell0 */

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