You can search for identifiers within the package.
in-package search v0.2.0
exception Regex_no_such_subpattern of int * int
exception Regex_no_such_named_subpattern of string * string
exception Regex_match_failed of string
exception Regex_submatch_did_not_capture of string * int
exception Regex_compile_failed of string
exception Regex_rewrite_template_invalid of string * string