You can use the
Saved Searches feature (Tools/Saved Searches... or Ctrl-Alt-F) to create a Group of searches.
Then when you want to run one, just highlight the title of the group - or even an individual search within the group to run that particular portion. The link above has all the details...its to the Sigil User Guide and has a section on Saved Searches.
Attached is one of the groups of regex's I use: