Function quoteMetaInCharClass

lib/util/compileBooleanMatcher.js:20–26

(char)

 * @returns {string} escaped character
 */
const quoteMetaInCharClass = (char) => {
	// In character class, only these need escaping: ] \ ^ -
	if (char === "]" || char === "\\" || char === "^" || char === "-") {
		return `\\${char}`;
	}
	return char;
};

/**
 * Converts an array of single characters into an optimized character class string