On Mon, 2002-01-07 at 19:43, Bjarni R. Einarsson wrote:
> On 2002-01-07, 14:33:07 (-0500), Brett Simpson wrote:
> > What effect does the asterisk have as opposed to the first>
> > expression? Thanks.
> > (?i)\.(exe)$
> > and
> > (?i)\.(exe)*$
> An asterisk matches zero-or-more of the preceding entity (be it a character,
> wildcard or something enclosed in parenthesis).
> So the first would match only "blah.exe", but the second would match
> "blah." and "blah.exe" (and "blah.exe.exe.exe.exe.exe").
Or more accurately, blah.exeexeexeexeexeexe - the dot isn't part of the
Note that Bjarni doesn't mention the commonly used ?, which means 0 or 1
So (?i)\.(exe|bat|pif)(\.(gz|bz\d?))?$ matches things like:
(The "\d" means the same as "[0-9]" - any numeric character.)
Note that a "." matches any *single* character, just to clarify Bjarni's
explanation, and a regexp matching any sequence of characters can be
written as ".*". A character can, indicentally, be anything - spaces,
tabs, and indeed any ASCII code is considered a character. AFAIK, Anomy
Sanitizer will only handle 8-bit/character character sets, which
probably covers you for any email you get.