Description:
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The regexs for preg_match() are suppose to work, but error occur

Test script:
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//test1.php
echo preg_match("/^(([A-Z][a-z]*)+\\)*([A-Z][a-z]*)+$/", 'Plz\TestMe');

//test2.php
echo preg_match("/^(([A-Z][a-z]*)+[\\])*([A-Z][a-z]*)+$/", 'Plz\TestMe');

Expected result:
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//test1.php - expected result
1

//test2.php - expected result
1

Actual result:
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//test1.php - actual result
Warning: preg_match() [function.preg-match]: Compilation failed: missing ) at offset 34 in path\to\test.php on line 3


//test2.php - actual result
0