Method letter

basex-core/src/main/java/org/basex/util/Token.java:1251–1253

Checks if the specified character is a computer letter (A - Z, a - z, _). @param ch the character to be checked @return result of check

(final int ch)

   * @return result of check
   */
  public static boolean letter(final int ch) {
    return ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z' || ch == '_';
  }

  /**
   * Checks if the specified character is a digit (0 - 9).