The preg_last_error_msg Function
The preg_last_error_msg function returns a human-readable message
about the last error that occurred when working with regular expression functions. This is a convenient alternative to the preg_last_error function,
which returns only an error code.
Syntax
preg_last_error_msg(): string
Example
Let's try to execute an invalid regular expression and get an error message:
<?php
preg_match('/invalid(regex/', 'test string');
echo preg_last_error_msg();
?>
Code execution result:
'No ending matching delimiter found'
Example
Let's check the error message when the backtrack limit is exceeded:
<?php
ini_set('pcre.backtrack_limit', 1);
preg_match('/(\d+)+$/', str_repeat('1', 1000));
echo preg_last_error_msg();
?>
Code execution result:
'Backtrack limit exhausted'
See Also
-
the
preg_last_errorfunction,
which returns the code of the last PCRE error -
the
preg_matchfunction,
which performs a regular expression match
