Forcing exp date for only one specific format

[ermamud]

I know exp date validators support both ways: MM/YY and MM/YYYY. But, Is there a way to force the validator to only validate one format? I 'd like to use only MM/YYYY in my project

[phill2mj]

@ermamud I've created a PR to address this: #58

[xenobardok]

Use minlength="9" to specify mm/yyyy or use max-length="7" to specify mm/yy