Pro PHP and jQuery by Jason Lengstorf.pdf - Computer Science ...

*
* Start by simply outputting the data
*/
echo $string;
?>
CHAPTER 9 ■ PERFORMING FORM VALIDATION WITH REGULAR EXPRESSIONS
Save this file, then load http://localhost/regex.php in your browser to view the sample script (see
Figure 9-1).
Figure 9-1. The sample file for testing regular expressions
Replacing Text with Regexes
To test regular expressions, you’ll wrap matched patterns with tags, which are styled in the test
document to have top and bottom borders, as well as a yellow background.
Accomplishing this with regexes is similar using str_replace() in PHP with the preg_replace()
function. A pattern to match is passed, followed by a string (or pattern) to replace the matched pattern
with. Finally, the string within which the search is to be performed is passed:
preg_replace($pattern, $replacement, $string);
■ Note The p in preg_replace() signifies the use of PCRE. PHP also has ereg_replace(), which uses the
slightly different POSIX regular expression syntax; however, the ereg family of functions has been deprecated as
of PHP 5.3.0.
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