donglengyuan6826 2012-05-09 10:47
浏览 27

regex&align:%HORIZONTAL%|%VERTICAL%

I would like to have a regex that matches something like this:

&align:%HORIZONTAL%|%VERTICAL%

%HORIZONTAL% may be "left" or "right" or "center"

%VERTICAL% may be "top" or "bottom" or "center"

I tried something like this:

&align:(left|right|center)\|(top|bottom|center)

And I got this:

Array(
[0] => &align:left|center
[1] => left
[2] => top
)

What would I have to change to get only one match at all? The [1] and [2] must not be possible.

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1条回答 默认 最新

  • dongpeng7744 2012-05-09 14:46
    关注

    Parentheses serve two purposes — grouping and capturing. To get the grouping you want without capturing the matches, use ?::

    &align:(?:left|right|center)\|(?:top|bottom|center)
    

    Manual reference: http://uk3.php.net/manual/en/regexp.reference.subpatterns.php

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