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PHP Regexp for Nested Parentheses

Posted on 2009-05-04
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Last Modified: 2012-06-27
I have a chunk of text in the form:

some text (more (text) with (possible nested) parentheses) (yet more (text) with (possible nested) parentheses) final text

I want to get the first set of nested parentheses i.e.

 (more (text) with (possible nested) parentheses)

I've tried preg_match("/\(([^\)]+|(?R))\)*/is",$text,$matches) but it gives me all the parenthses i.e.

(more (text) with (possible nested) parentheses) (yet more (text) with (possible nested) parentheses)

I've also tried preg_match("/\(([^\)]+|(?R))\)*/is",$text,$matches) but this produces eratic results (sometimes chopping off stuff after a nested closing parenthesis, sometimes not).

Any sugestions?
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Question by:guyharleyaus
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4 Comments
 
LVL 84

Expert Comment

by:ozo
ID: 24302139
if rhe parentheses are only nested two deep, you could do
/(\((?:\([^()]*\)|[^()]+)*\))/
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Author Comment

by:guyharleyaus
ID: 24302182
The parentheses can be nest multiple layers e.g.

(some (text (with (nested) parentheses) and) (other stuff))
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LVL 84

Accepted Solution

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ozo earned 50 total points
ID: 24302448
/(\((?:(?>[^()]+|(?R))*)\))/
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