Re: I'm confused about Regular Expressions.

On Wednesday 21 February 2001 18:42, Kenneth R Zink II wrote: > > I was just reading at DevShed on how to use Regular Expressions, but > now I'm even more confused. > > Can someone please explain how I would use a REGEX to determine in and > uploaded file is a .gif or .jpg file? if (preg_match ('/\.(gif|jpg)$/i', $filename, $matches)) { echo "Congratulations, it's a " . $matches [1] . "!<br>"; } else { echo "Wrong file type!<br>"; } Explanation: /.../ are the "regular expression quotes", i.e. the real expression is between these slashes The "i" after them means "do a case insensitive match" (a "pattern modifier") \.(gif|jpg) means "match if the string contains a dot followed by either "gif" or "jpg"" The dot has to be escaped (prepended with a backslash) because a dot in a regexp has a special meaning: "match any char". The escaping makes it behave as a literal dot The "$" means "here has to be the end of the string" (an "anchor") => the entire pattern means "match if the string ends with a dot followed by either 'gif' or 'jpg', and ignore case for this" -- Christian Reiniger LGDC Webmaster (http://sunsite.dk/lgdc/) I saw God --------- and she was black.