Checking for any character using regular expressions in multiline text

\S does not / did not work on all versions of RegExp on Microsoft JScript / VBScript (sorry to be vague - I just recall having to avoid it because it was flakey).

Instead you could try Start([.|\n]*)End (match everything except newline and newline)

Update: Checked some old code: I could not get \S to work in VBScript (don't comment on this) in a module originally designed for MS-IE4.0.