The x modifier code in this tutorial Php regex tutorial gives me the following error:
Warning: preg_match() [function.preg-match]: Unknown modifier ' ' in C:\xampp\htdocs\validation\test.php on line 16
Pattern not found
What's wrong with it?
<?php
// create a string
$string = 'sex'."\n".'at'."\n".'noon'."\n".'taxes'."\n";
// create our regex using comments and store the regex
// in a variable to be used with preg_match
$regex ="
/ # opening double quote
^ # caret means beginning of the string
noon # the pattern to match
/imx
";
// look for a match
if(preg_match($regex, $string))
{
echo 'Pattern Found';
}
else
{
echo 'Pattern not found';
}
?>
You have an extra newline in the modifiers because the terminating quote is on a new line after imx, that is why you are seeing unknown modifier ' '
ReplyDeleteTry changing it to this:
$regex ="
/ # opening double quote
^ # caret means beginning of the string
noon # the pattern to match
/imx"; // move "; to same line as /imx
PHP gives you the reason for the error in the warning message: Unknown modifier ' '.
ReplyDeleteObviously you are not allowed to have white space in the modifier list after the ending delimiter / in your pattern. You can remove this white space with the trim() function:
if (preg_match(trim($regex), $string))
// ...