Regular expression - starting and ending with a character string

Question

I would like to write a regular expression that starts with the string \"wp\" and ends with the string \"php\" to locate a file in a directory. How do I do it?

Examp

Answer 1

Example: ajshdjashdjashdlasdlhdlSTARTasdasdsdaasdENDaknsdklansdlknaldknaaklsdn

1) START\w*END return: STARTasdasdsdaasdEND - will give you words between START and END

2) START\d*END return: START12121212END - will give you numbers between START and END

3) START\d*_\d*END return: START1212_1212END - will give you numbers between START and END having _