W3cubDocs

/PHP

preg_last_error

(PHP 5 >= 5.2.0, PHP 7)

preg_last_error — Returns the error code of the last PCRE regex execution

Description

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!

Return Values

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
  • PREG_BAD_UTF8_OFFSET_ERROR (since PHP 5.3.0)
  • PREG_JIT_STACKLIMIT_ERROR (since PHP 7.0.0)

See Also

© 1997–2020 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://www.php.net/manual/en/function.preg-last-error.php