Javascript debugger
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Returns one of the following constants (explained on their own page):
PREG_NO_ERROR |
PREG_INTERNAL_ERROR |
PREG_BACKTRACK_LIMIT_ERROR (see also pcre.backtrack_limit) |
PREG_RECURSION_LIMIT_ERROR (see also pcre.recursion_limit) |
PREG_BAD_UTF8_ERROR |