English is a common base. Not everyone understands Regex or enough about math. If you use Regex, some people might not be able to understand and change your Regex if necessary.
Well, most of the time, no one else needs to understand it ...
Well, most of the time, no one else needs to understand it ...
The hard part of regular expressions is envisioning the languages they accept. It's not primarily a difficulty with notation as with the concepts the notation encodes.