Strip ASP code with Preg_Replace

I need to strip legacy ASP code from include files in a PHP app - I'm attempting to match everythi开发者_运维问答ng between <% and %> with the regexp /(<%([.\r\n\r])+%>)/ through preg_replace, but it's failing. Where did I go wrong?

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The dot [.] does not apply to all characters when inside a [character class]. Consider this one instead:

/(<%.+?%>)/

It can be read as "match <% then as few of anything as possible, followed by %>". This lazy one won't eat the code inbetween <% ... %> and the next <% ... %>.

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To mach everything between <% and %> the expression would be:

/<%(.*?)%>/

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You're not using your character class correctly (I assume you're trying to match all charaters and newlines). Try:

/(<%(.)+?%>)/s

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preg_replace('/<%(.*)%>/s', '$1', $string);