preg_grep
The above function pcre_error_deocde [sic] is not correct - not all of the used constants are errors constants. For example, when the error is actually PREG_BAD_UTF8_ERROR, the function outputs the text for PREG_SPLIT_OFFSET_CAPTURE.
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_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)
add a note
User Contributed Notes
preg_last_error - [2 notes]
johan at bluemoonit dot net ¶
2 years ago
Omer ¶
2 years ago
here's the code to check for all errors
<?php
if (preg_last_error() == PREG_NO_ERROR) {
print 'There is no error.';
}
else if (preg_last_error() == PREG_INTERNAL_ERROR) {
print 'There is an internal error!';
}
else if (preg_last_error() == PREG_BACKTRACK_LIMIT_ERROR) {
print 'Backtrack limit was exhausted!';
}
else if (preg_last_error() == PREG_RECURSION_LIMIT_ERROR) {
print 'Recursion limit was exhausted!';
}
else if (preg_last_error() == PREG_BAD_UTF8_ERROR) {
print 'Bad UTF8 error!';
}
else if (preg_last_error() == PREG_BAD_UTF8_ERROR) {
print 'Bad UTF8 offset error!';
}
?>