While the request in https://sourceforge.net/p/cscope/support-requests/17/ certainly smacks of OP having not really done their homework, the feedback to 'go read the manpage of regcomp' is not completely correct; some reg.exes that are legal according to POSIX ERE aren't accepted when searching for regular expressions, whereas they work fine with other fields, eg "find this symbol"
example: "reg{1}comp"
Ticket moved from /p/cscope/bugs/298/