(PHP 5 >= 5.2.0, PHP 7)
preg_last_error — Returns the error code of the last PCRE regex execution
preg_last_error ( ) : int
Returns the error code of the last PCRE regex execution.
Example #1 preg_last_error() example
<?php
preg_match('/(?:\D+|<\d+>)*[!?]/', 'foobar foobar foobar');
if (preg_last_error() == PREG_BACKTRACK_LIMIT_ERROR) {
echo 'Backtrack limit was exhausted!';
}
?> The above example will output:
Backtrack limit was exhausted!
Returns one of the following constants (explained on their own page):
PREG_NO_ERRORPREG_INTERNAL_ERRORPREG_BACKTRACK_LIMIT_ERROR (see also pcre.backtrack_limit)PREG_RECURSION_LIMIT_ERROR (see also pcre.recursion_limit)PREG_BAD_UTF8_ERRORPREG_BAD_UTF8_OFFSET_ERROR (since PHP 5.3.0)PREG_JIT_STACKLIMIT_ERROR (since PHP 7.0.0)
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https://www.php.net/manual/en/function.preg-last-error.php