how to use regex in JS

Question

replace(/(?<=<\?php)[\w\W]*(?=\?>)/g, " ");

I want to replace the words between <?php and ?>, but it doesn't work in JavaScript. I have heard that JavaScript doesn't support regular expressions. How else can I solve this problem?

Whoever told you that JavaScript doesn't support regular expressions is sorely misinformed. — Ry-
– Ry- ♦, Commented Jun 24, 2012 at 2:36
Why do you have text between <?php ?> that is available to JavaScript? Hopefully it has not been sent down to the client. — Michael Berkowski
– Michael Berkowski, Commented Jun 24, 2012 at 2:37

Ry- · Accepted Answer · 2012-06-24 02:37:33Z

6

JavaScript doesn't support lookbehinds (the (?<= part) in regular expressions. You can just replace it with <?php ?> and drop the assertions, though:

replace(/<\?php.+?\?>/g, "<?php ?>");

answered Jun 24, 2012 at 2:37

Ry-♦

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1 Comment

gdoron Over a year ago

@final. If it helped you, don't forget to click on the check sign on the left of the answer.

matt3141 · Accepted Answer · 2012-06-24 02:37:23Z

1

Look behinds and look aheads do not work instead rewrite your regex.

replace(/(<\?php)([\w\W]*)(\?>)/g, "$1$3")

answered Jun 24, 2012 at 2:37

matt3141

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