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I have a few reg expressions that work on dart but this one for some reason always returns false. I'm trying to validate an ID, code below

 if (RegExp(r'/^[0-9]{3}-[0-9]{4}-[0-9]{7}-[0-9]{1}$/').hasMatch('123-1234-1234567-1')) {
              debugPrint('ID valid');
            } else {
              debugPrint('Invalid');
            }
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    'new' is not necessary in Dart2. Commented Aug 29, 2020 at 10:41

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Drop the slashes, regex delimiters are not needed:

print(RegExp(r'^[0-9]{3}-[0-9]{4}-[0-9]{7}-[0-9]{1}$').hasMatch('123-1234-1234567-1'));

prints true.

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