Regular how to set group value?

Question

Regular Expressions

There is a regular expression of the form
/^(?P<param>(?(?=var)|.*))$/u
and the string
var/test
or
vas/test
It is necessary that if the string starts with "vas", then in the "param" group, write not the entire string "vas/test", but only the end of the string equal to "test"
Example https: //regex101.com/r/kQ1nG0/1

Answer 1

Hello.
You don't need a regex for this. It will only get harder for her.
If you write in php, then look for search functions directly either var/test or vas/test.
But if you really need it with a regular season, then here:
I suffered a little.
See here
The pcre(php) engine is used. Need modifier J