When the Find command has “Matches Word” enabled, it can’t find “words” that contain most symbol characters.
e.g., let’s say I want to do this find-and-replace (see attached) and only find $action when it’s the whole variable name. This string can’t be found. (I know there are workarounds but this seems like it should work.) Underscores don’t have this issue but most symbols do. (Perhaps in PHP documents $ could be given the same non-token-delimiting status as _ ?)