# numericOnly method

String numericOnly({

1. bool firstWordOnly = false,

})

Extract numeric value of string Example: OTP 12312 27/04/2020 => 1231227042020ß If firstWordOnly is true, then the example return is "12312" (first found numeric word)

## Implementation

    String numericOnly({bool firstWordOnly = false}) {
      String numericOnlyStr = '';

      for (int i = 0; i < length; i++) {
        if (this[i].isNumericOnly) {
          numericOnlyStr += this[i];
        }
        if (firstWordOnly && numericOnlyStr.isNotEmpty && this[i] == " ") {
          break;
        }
      }

      return numericOnlyStr;
    }