I am making sign up screen

[HarshVardhanSolanki]

I found 3 which one is the best for my query?

I checkout all of the how they will help me they are just matching tools only, how to replace with those extensions.

I found this best :

[FREE] Extension Xreg V1.2- PCRE regular expressions for App Inventor!

1-Introduction The Xreg extension only contains two methods but covers 95% of Java functionality on regular expression. What does it do more than the other two extensions that exist? It works for matches, capture groups, and any sort of replacement in string! See the following post: [Regular Expression] Both methods are designed simple enough to be integrated into App Inventor as on-chain blocks. See the same integration in AutoIt: https://www.autoitscript.com/autoit3/docs/functions/StringR…

but don't know how it will help me.