Adjusted regex for strippables

Usually, characters following the pattern to strip are expected to be non-alphanumeric.  However, alphanumeric characters should be allowed if last character of the pattern to strip is non-alphanumeric.

The problem I got is when we want to strip a MACRO() and this macro is followed by an alphanumeric character.  For example, if we add `IFRPC_ALEN\s*\(+.*?\)+` to 'strippables'

`int MyFunction( IFRPC_ALEN(4) int param)` 

would be correctly stripped, but not

`int MyFunction( IFRPC_ALEN(4)int param)` 

because the macro is followed by an alphanumeric character.