Question

I’m using the following regex to validate one of my models

validates :login,
  :format => {:with => /[A-Za-z][A-Za-z0-9_]+/}

And one of my tests is failing because this regex is matching this string, passing it as valid

a+df

What am I missing here?

Answer 1

It matches the df substring. Use anchors to force the regex to match the string in its entirety:

validates :login,
  :format => {:with => /\A[A-Za-z][A-Za-z0-9_]+\Z/}