CODEWITHSUNDEEP
phpregexpreg-replace
Shackrock
Shackrock

Reputation: 4701

How to transform this Regex

I'm trying to figure out what this does, and how to change it.

preg_replace('/[^\w\s]/','',$var);

I THINK this replaces all symbols with nothing (deletes them basically). What if I want to allow some specific symbols, what do I change here?

For example I want replace everything EXCEPT:

Thanks.

Upvotes: 0

Views: 64

Answers (2)

Jeroen
Jeroen

Reputation: 13257

^ means everything but this, so this replaces everything but word characters (\w) and whitespace (\s).

To replace everything except the characters you mention, use this:

preg_replace('/[^\w\s\/]/', '', $var);

\/ is the escaped version of /.

Upvotes: 2

Tremmors
Tremmors

Reputation: 2966

that is basically: "find everything that's not a word character or a space character and remove it from the string"

^ is a negation, so you can put whatever you want after that in the [] and it will skip those. It is already doing everything you want except for the /

Note : \w is shorthand for [0-9A-Za-z_] (or close to it.)

from a perl.org

\w is a word character (alphanumeric or ) and represents [0-9a-zA-Z]

Upvotes: 1

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