convert javascript (regex) function to php

Question

When an key is pressed in an input I call this on its value

.trim().replace(/ /g, '.').replace(/[^\w .-]/gi, '').toLowerCase();

what I want to do is, when the value is submitted to the server I want to do a function that will take the value, fun the php version of this function over it, and if the new string is different to the original string return false, else return true.

So, What is the php equivelent of the above line of code?

obviously I can use strtolower(str_replace(' ', '.', trim($value)))

which means I just need to equivelent of .replace(/[^\w .-]/gi, '')

Leif · Accepted Answer · 2011-06-24 13:54:16Z

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preg_replace('/[^\w .-]/', '', $subject);

Notes: The global flag g is not needed in php. Flag i is not necessary for \w.

And as a side note: You don't actually need the space in the character class because you removed spaces already.

answered Jun 24, 2011 at 13:54

Leif

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rciq · Accepted Answer · 2011-06-24 13:45:54Z

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Could it be preg_replace(pattern, replacement)?

http://php.net/manual/en/function.preg-replace.php

answered Jun 24, 2011 at 13:45

rciq

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3 Comments

Felix Kling Over a year ago

@Hailwood: If you add delimiters, yes. Googling for php regular expression revealed: regular-expressions.info/php.html I suggest to have a look at it.

rciq Over a year ago

It should. Here's the syntax rerefence for PCRE (used in preg_ functions): regextester.com/pregsyntax.html

rciq Over a year ago

Like Felix said, you need to note it as a string literal (JavaScript has Regex literals; PHP does not), so just wrap it around with ' quotes.

Community · Accepted Answer · 2023-11-17 19:32:19Z

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looks like your found strtolower and trim on your own. to replace something using a regular expression, simply use preg_replace (or preg_filter if the replacement should be a regular expression, too).

depending on wich version of php you're using, theres also ereg_replace, but you shouldn't rely on that as it's deprecated. if possible, use preg_replace/preg_filter.

edited Nov 17, 2023 at 19:32

CommunityBot

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answered Jun 24, 2011 at 13:46

oezi

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