fast-escape-regexp/dist/index.js

Fastest, plain JavaScript-based, regexp escaping library for JavaScript, works in both Node.js and browser.

Object.defineProperty(exports, '__esModule', { value: true });

const rR = /[$()*+.?[\\\]^{|}]/;
const rU = /[$()*+.?[\\\]^{|}-]/;
/**
 * Escape characters with special meaning either inside or outside character sets.
 * Use a simple backslash escape when it’s always valid, and a `\xnn` escape when the simpler form would be disallowed by Unicode patterns’ stricter grammar.
 *
 * When the `unicodeMode` is `true` (default), the `-` character is escaped as `\x2d` to ensure compatibility with Unicode patterns, PCRE, and MongoDB.
 *
 * You should only disable this option if you are escaping regular expressions that will later be consumed by runtimes w/o unicode flag support.
 */ function escapeRegexp(str, unicodeMode = true) {
    const match = (unicodeMode ? rU : rR).exec(str);
    if (match === null) {
        return str;
    }
    // we hoist this condition out of the loop for better performance
    // eslint-disable-next-line sukka/unicorn/prefer-string-raw -- performance
    const unicodeEscapeForDash = unicodeMode ? '\\x2d' : '-';
    let escape = '';
    let regexp = '';
    let index = match.index;
    let lastIndex = 0;
    // iterate from the first match
    for(const len = str.length; index < len; index++){
        /* eslint-disable sukka/unicorn/prefer-string-raw -- performance */ switch(str.charCodeAt(index)){
            case 94:
                escape = '\\^';
                break;
            case 46:
                escape = '\\.';
                break;
            case 42:
                escape = '\\*';
                break;
            case 43:
                escape = '\\+';
                break;
            case 63:
                escape = '\\?';
                break;
            case 40:
                escape = '\\(';
                break;
            case 41:
                escape = '\\)';
                break;
            case 91:
                escape = '\\[';
                break;
            case 93:
                escape = '\\]';
                break;
            case 123:
                escape = '\\{';
                break;
            case 125:
                escape = '\\}';
                break;
            case 92:
                escape = '\\\\';
                break;
            case 124:
                escape = '\\|';
                break;
            case 45:
                escape = unicodeEscapeForDash;
                break;
            case 36:
                escape = '\\$';
                break;
            default:
                continue;
        }
        /* eslint-enable sukka/unicorn/prefer-string-raw */ if (lastIndex !== index) {
            regexp += str.slice(lastIndex, index);
        }
        lastIndex = index + 1;
        regexp += escape;
    }
    if (lastIndex !== index) {
        regexp += str.slice(lastIndex, index);
    }
    return regexp;
}

exports.escapeRegexp = escapeRegexp;