CODEWITHSUNDEEP
php
Sumit Kumar
Sumit Kumar

Reputation: 781

php preg_replace replacing hashtags

I'm using this code to make hashtags:

preg_replace(  '/\#([A-Za-z0-9]*)/is', ' <a href="tag/$1"> #$1</a> ', $text);

It works, but when it comes across this: "it#039;s" ( "it's" ), it replaces it as well. So I guess I want it to only replace hashtags if they have a white space before them, or are at the beginning of the line. Something like in this string below:

This is a #tag and this is #anotherTag but the word "it's" and "it#039;s" is not being replaced

How do I change the preg to do this? Thanks

Upvotes: 0

Views: 1345

Answers (1)

Jamie Bicknell
Jamie Bicknell

Reputation: 2326

The concept you're looking for is a negative lookbehind

/(?<!=|\b|&)#([a-z0-9_]+)/i

Notice the ?<!= part, this is saying match the hashtags where there isn't a \b or # in front of it.

Upvotes: 1

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