[^jpg] is a character class - meaning you match either j, p, org.
Update: and the ^ negates the character class, so [^jpg] matches a single character that is not j, p, or g.
Other than that, I feel your list is incomplete. Why won't you allow .svg images?
And are you aware that it's completely possible to write a script in, say some CGI capable language such as Perl indeed, that would be called my-image-script.(txt|html|bananajuice) that would still generate a valid image in whatever format? But your regexp would disallow it. Is that intentional?
Anyway, this should help you along...
\[img\] # Match opening tag
\s* # Maybe there are spaces inside
.*? # Non-greedy match
\. # A dot
(?: # Non-capturing group
) # End of group
\s* # Maybe there are more spaces still
\[/img\] # Match closing tag
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
Outside of code tags, you may need to use entities for some characters:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||