JMeter : Regular Expression https://regex101.com/ or https://regexr.com/ ^(.*)?

^(.*)?     Match all text

http://jkorpela.fi/perl/regexp.htmlf


()   Group
.    any character
?   preceding is optional
* 







the brackets inside will be called as groups .
.     represent any single character except line break,
* represent repeat of previous character n number of times.
? represent * is optional.

so finally , in between my          name, the value will be matched as created as Groups.
So Group1 is pradeep
     Group2 is  kumar
and so on with the match number.