@syntropiq/py-regex/dist/compile.js

Python-compatible regular expressions for TypeScript/JavaScript, mirroring Python's re/regex API.

import { PCRE } from '@syntropiq/libpcre-ts';
let _pcreInstance = null;
/**
 * Get or create the singleton PCRE instance
 */
async function getPCREInstance() {
    if (!_pcreInstance) {
        _pcreInstance = new PCRE();
        await _pcreInstance.init();
    }
    return _pcreInstance;
}
/**
 * Convert Python named capture groups (?P<name>...) to PCRE format (?<name>...)
 */
export function convertNamedGroups(pattern) {
    return pattern.replace(/\(\?P<([^>]+)>/g, '(?<$1>');
}
/**
 * Compile a PCRE regex with fullmatch semantics (like Python's re.fullmatch).
 * Anchors the pattern at both ends and uses ANCHORED, UTF8, and UNICODE options.
 */
export async function compileRegex(pattern) {
    const pcre = await getPCREInstance();
    // Convert named groups from Python to PCRE format
    const pcrePattern = convertNamedGroups(pattern);
    // Use ANCHORED and UTF8 options for Python-like fullmatch
    const opts = pcre.constants.ANCHORED | pcre.constants.UTF8;
    // Always anchor at both ends for fullmatch semantics
    const anchoredPattern = pcrePattern.startsWith('^') ? pcrePattern : '^' + pcrePattern;
    const finalPattern = anchoredPattern.endsWith('$') ? anchoredPattern : anchoredPattern + '$';
    return pcre.compile(finalPattern, opts);
}
/**
 * Compile a regex pattern using PCRE without fullmatch anchoring
 * Useful for partial matching or when you want to control anchoring manually
 */
export async function compileRegexPartial(pattern) {
    const pcre = await getPCREInstance();
    // Convert named groups from Python to PCRE format
    const pcrePattern = convertNamedGroups(pattern);
    // Use UTF8 option but not ANCHORED for partial matching
    const opts = pcre.constants.UTF8;
    return pcre.compile(pcrePattern, opts);
}
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