PHP matches strings that start with "ABC" and Cannot End with "XYZ"

This article introduces, with the PHP regular area with "ABC" beginning, and can not be "xyz" end of the string method, the need for a friend reference.

Requirements:
Use the PHP regular expression match to start with "ABC", but the end cannot contain the string "X", "Y", "Z".

Analytical:
ABC begins with a regular write: ^abc.
Start with ABC, followed by a string of strings
The general use of [^ ....] To deny it.
Since it is the negation of "X", "Y", "Z", it is [^xyz].

The complete regular expression is this:

^abc[^xyz]*$

The following is a full PHP example that uses this regular, as follows:

<?php$str = ' abcdef124f '; $search = '/^abc[^xyz]*$/'; if (Preg_match ($search, $str)) {echo $str. ' In accordance with <br/> ';} else {echo $str. ' does not conform to <br/> ';} Output abcdef124f conforms to $str = ' abcdef12x124 '; {preg_match ($search, $str) {echo $str. ' In accordance with <br/> ';} else {echo $str. ' does not conform to <br/> ';} Output abcdef12x124 does not conform to//edit by www.jbxue.com?>

PHP matches strings that start with "ABC" and Cannot End with "XYZ"