It does not in any way follow from this view that the search query is allowed to be (and actually should be) a regular expression:
E.g. on GitHub you need to wrap regexps into /.../. On Codesearch, this doesn't work, but bare queries are treated as regexps (so if you query col.rd, you get colord in your results).
Two more things unclear:
- Is there a way to search simple terms instead of regexps?
- And there are also different regexp formats. Which one does Codesearch use?