Feature request : Regex tester

[HariKrishna-28]

Requesting a feature that lets the users test regular expressions.

[nikhilmaske-2001]

Basic Regex testing feature is implemented in #77 . Please review.

If we want more features like https://regex101.com/r/DH2cXe/1 we can create sub-tickets of this tickets mentioning each feature in detail. Till then can we go with #77 ?

[sarim2000]

@HariKrishna-28 have u checked this pr #80

[sarim2000]

@HariKrishna-28 check pr #93