Replace non-html links with tags

Question

I have a block of code that will take a block of text like the following:

Sample text sample text http://www.google.com sample text

Answer 1

Add code to the beginning of the pattern to capture an opening anchor tag, and then do not perform the callback code when it has captured something:

/(]*>)?http:\/\/([,\%\w.\-_\/\?\=\+\&\~\#\$]+)/

You will then need to add an if to your lamda function to see if there is anything in $matches[1] (Don't forget to increment your captures as well)

You cannot use a negative look behind assertion here as the capture is not a fixed length, but you could use a negative look ahead assertion for the closing tag so it drops the entire match:

/(]*>)?http:\/\/([,\%\w.\-_\/\?\=\+\&\~\#\$]+)(?!<\/a>)/