log-view-file-re

log-view-file-re is a variable defined in `log-view.el'.
Its value is

"^\\(?:Working file: \\(?1:.+\\)\\|\\(?:SCCS/s\\.\\|Changes to \\)\\(?1:.+\\):\\)\n"

Documentation:
Regexp matching the text identifying the file.
The match group number 1 should match the file name itself.