RegExp: Ignore 2 consecutive slashes but match 1 single slash

Solution for RegExp: Ignore 2 consecutive slashes but match 1 single slash
is Given Below:

I’m creating a string validator using RegExp and I need it to match single slash (/) but not match double slashes (// OR https?://). I need exactly the opposite of what (/{2,2}) does.

The final RegExp I need will be consisted from this sub expression and [^A-Za-zÀ-ü0-9.:_ @ü+-]

Thanks for help!

If you want to match also the three slashes you can use this:

(?:^|[^/])(/(?:(?!/)|/{2,}))

For the rest, ou are right, there is no AND in regular expressions, but there is OR 🙂 For joining the two regexps you can use this:

^(?:[^A-Za-zÀ-ü0-9.:_ @ü+-/]|/(?:(?!/)|/{2,}))*$

Notice that I added a / in the first member of the alternation. So you remove from the valid characters also the slash, but you re-add it using alternation ensuring at the same time that it is not followed by a second slash OR it is followed by at least two slashes.

See a demo here.