ovid offered some good advice, all but for one thing. Please, DO NOT USE THIS LINE FROM OVID'S REGEX:

[^-]+
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take the folowing line for example,

<img src="this.gif"><img src="something-disclose.gif">
[download]

what do you think his regex will match ... think carefully--it matches the whole line. I recomend reading the book by Jeff Freidel (sp?) called Mastering Regular Expressions. In it, he stresses to say what you really mean. You should replace this line:

[^-]+
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with this:

[^->]
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The reason is that ^- means anything but a dash, well the > sign isn't a dash, so his regex will match that, all the way to the first -, witch could be in another image tag on the same line.

The 15 year old, freshman programmer,
Stephen Rawls