Regular Expressions (std/regex)

from "std/regex" import { Regex, RegexMatch }

Regex is a compiled regular expression. Compilation is fallible; searching a valid expression may simply find no match. Keeping those outcomes separate is the module's error model.

API

fn Regex.compile(pattern: string): Result<Regex>
fn Regex.compileFlags(pattern: string, flags: i32): Result<Regex>
fn Regex.isMatch(self: &Regex, input: &string): bool
fn Regex.find(self: &Regex, input: &string): Option<RegexMatch>
fn Regex.findAll(self: &Regex, input: &string): Vec<RegexMatch>

RegexMatch.start and .end are byte offsets into the input string.

let re = Regex.compile("[0-9]+")?
if re.isMatch("abc123") {
    let first = re.find("abc123")!
    print("abc123"[first.start..first.end])
}

Compile once and reuse the value. Windows currently fails loudly because the pure-Milo regex engine remains planned; macOS and Linux use POSIX regex.