Remember when I mentioned that you need delimiters to specify a PCRE? If you were wondering why, here's an explanation. PCRE introduces the concept of "modifiers" that can be appended to a regular expression to alter the behavior of the regex compiler and/or interpreter. A modifier is always appended at the end of an expression, right after the delimiter. For example, in the following regex:

/test/i

the last i is a modifier.

There are many different modifiers. Perhaps the most commonly used one is i, which renders the regular expression non case sensitive. Here's an example of how it works:

<?php

    $s = 'Another beautiful day';

    echo (preg_match ('/BEautiFul/i', $s) ? 'MATCH' : 'NO MATCH') . "\n";

?>

If you execute the preceding script, it will output the word "MATCH", indicating that the regex succeeded because the i modifier made it not case sensitive.

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