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preg_match_all
PCRE Functions
PHP Manual

# preg_last_error

(PHP 5 >= 5.2.0)

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

### Description

int preg_last_error ( void )

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) {
print '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_grep
preg_match_all
PCRE Functions
PHP Manual