Dart Regex for matching number or certain characters at the end of String

I’m trying to check for either numbers, ‘e’, ‘π’ or ‘ ‘ at the end of a String.

This is what I’m using: \s|[0-9]|e|π$. This is the code:

final regex = RegExp(r'\s|[0-9]|e|π$');

if (regex.hasMatch(_expression)) {  //_expression is the string
    //body
}

This always returns true. What’s the error here?

Try with the following regular expression:

void main() {
  final regex = RegExp(r'(\s|[0-9]|e|π)$');

  print(regex.hasMatch('959**')); // false
  print(regex.hasMatch('959')); // true
}

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