Method quoteMeta

java/com/google/re2j/RE2.java:495–506

Returns a string that quotes all regular expression metacharacters inside the argument text; the returned string is a regular expression matching the literal text. For example, quoteMeta("[foo]").equals("\\[foo\\]").

(String s)

   * {@code quoteMeta("[foo]").equals("\\[foo\\]")}.
   */
  static String quoteMeta(String s) {
    StringBuilder b = new StringBuilder(2 * s.length());
    // A char loop is correct because all metacharacters fit in one UTF-16 code.
    for (int i = 0, len = s.length(); i < len; i++) {
      char c = s.charAt(i);
      if ("\\.+*?()|[]{}^$".indexOf(c) >= 0) {
        b.append('\\');
      }
      b.append(c);
    }
    return b.toString();
  }

  // The number of capture values in the program may correspond
  // to fewer capturing expressions than are in the regexp.