Regular Expression to find search text between parentheses

Something like this?

$postVal = "find me";
$pdfdata = "This is a test of a string that (will find me between) parentheses.";
preg_match('/\([^\(\r\n]*'.$postVal.'[^\(\r\n]*\)/i', $pdfdata, $matches);
print_r($matches);

Output:
Array
(
    [0] => (will find me between)
)

If you want do that with javascript, then it is very simple

var str = "This is test string (which you are looking for)";
alert(str.replace(/^.*\((.*)\).*$/m, '$1'));

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Live Demo :

http://jsfiddle.net/R8WGt/

An interesting wrinkle on this question... What if the parenthetical expression contains a parenthetical expression?

Thanks for the input.  Will award points shortly.  Just curious.  The  application here is that I am searching for keywords or text in a converted PDF document that has been OCR'ed or saved with Adobe Acrobat from Powerpoint.  As an example, there is a lot of formatting data in the document and other data that looks like the text that I am searching for.  e.g.


Following looks like text that appears on my ppt slides.


Q
BT
0.19 0.147 0.152 0 k
/TT0 1 Tf
24 0 0 24 195.873 160.2 Tm
[(Submitted by: Dr. Gay, M.D. )250( )]TJ
3.861 -1.167 Td
[(Professor of Radiology)250( )]TJ
3.333 -1.208 Td
(8/25/11)Tj
0.149 0.113 0.118 0 k
/TT1 1 Tf
2.806 0 Td
( )Tj
ET


......


BT
0 0 0 0 k
/TT0 1 Tf
44 0 0 44 99.125 491.7999 Tm
[(Based on these images, what is)233( )]TJ
1.05 -1.182 Td
[(the most likely diagnosis?)250( )]TJ
0.029 0 0.342 0 k
32 0 0 32 131.125 366.5 Tm
(1.)Tj
0.022 0 0.281 0 k
/C2_0 1 Tf
<0001>Tj
0 0 0 0 k
/TT0 1 Tf
1.361 0 Td
(Invasive ductal carcinoma )Tj

following looks like text elsewhere in the document:

(6y´Î"†ú9¿•#Ngì´…°úécè-ïIüñyà·ÿPåÛEné]s˜x¿›/´ÚvªYï)Ò—lF°œp+Å¿¿€3SJ°Û,N¿¿F8F!J[LëÌŸ/ج Gäuuu9Ò˜µC¿p†Áz.MT»±oY<K*S°2o´ª]±Ï€°~=6¿Ä`Í2Ë!/§£›.~¿´=RJTòä*ja.®Ô#i[
ÿÓÏf‚¿‹ôL¶¿{qÕ›WHpn€is”ƒQë/¥_7*ëKsÿgj¿¿¶5æåµ÷¿ÆOBz7Á•àS#ÁÇ–FY»0é(óv‡/\g1õ^¿}
º)ôœmgaY¿?.ãí4râ)


If I search for "gay" in this case there is a match in the ppt text portion and a match in the "elsewhere" data display above (gaY) at the end of the string.

Just wondering if there is some standard method to search for text words or  phrases within a pdf document, which is what I am trying to do.  The solution above works for the most part since what I am search for (e.g. idiopathic, lipoma, etc.) is probably only going to show up in the text data, but some short words may be in the encoded text as well.  I am sure there are tools or methods already out there for doing that sort of thing.