The "Search and replace" dialog can search using regular expressions, which is great, but many users don't know regexes at all and those who do may have doubts about the precise syntax. There should be a link from the dialog to a reference page that details the regular expression syntax which is relevant to the user's browser. (I suppose that the employed regex syntax is the one in the JS engine of the user's browser and maybe there are differences between the engines; correct me if i'm wrong.)
This link should be added to all languages. Probably the target page will be available only in English and maybe a few other common languages (French, Russian, Japanese); English should probably the fallback for most languages if a translation is not available. (If a translation is written, the link can be updated.)
Version: unspecified
Severity: enhancement