dsa1230000 2014-08-13 22:03
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preg_match优化 - 正则表达式太慢了

(.[^ ]*?)\[code](.*?)\[\/code](.[^ ]*?)(*SKIP)(*F)|(.[^ ]*?)\[php](.*?)\[\/php](.[^ ]*?)(*SKIP)(*F)|some_rules_here

The pattern above makes the function work too slow.

With it: http://regex101.com/r/qP4tT5/1 Page gets loaded in more than 3 seconds. Regex debugger says it took 5153 steps in total to execute the regex.

Without it: http://regex101.com/r/fG4tW0/1 Page gets loaded in only 0,3 seconds Regex debugger says it took only 4 steps to execute the regex.

Why do I have to use it: Because if the emoticon's shortcut is inside a [code] or [php] tag, it shouldn't be HTMLed.

Is there an alternative method which does the same thing faster?

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  • doupin8555 2014-08-13 22:13
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    You can simplify this regular expression a bit.

    ~\[(code|php)][^[]*\[/\1](*SKIP)(*F)|:\(~i
    

    enter image description here

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