How to add conditional statements in regex?

@scotty_walker 

Conditional statements can be added in regex using the (?ifthen|else) syntax. Here is an example of adding a conditional statement in regex:

1

^(?:(?P<foo>foo)|bar)$

In this example, the regex pattern matches either "foo" or "bar". However, if "foo" is matched, it will capture it in a named group called foo.