Comments on: Getting Started with PHP Regular Expressions

By: Hans Lee

Hans Lee — Fri, 19 Feb 2010 06:04:55 +0000

You could test your regexp in the PHP regexp tester.

http://www.pagecolumn.com/tool/pregtest.htm

The regexp should be
/(\w+)\s(\1)/

By: Kian Ann

Kian Ann — Tue, 02 Feb 2010 01:24:52 +0000

Further to my confusion, I’ve went to test the replace duplicate words regex out and it doesn’t work… at least not for me.

return preg_replace(”/s(w+s)1/i”, “$1?, $text);

I went around doing some searches and ended up asking a friend. This works to replace duplicate words:

return preg_replace(”/(\w+)\s(\\1)/”, “$1″, “Oh this this is good”);
// returns “Oh this is good”

But this replaces only 1 duplicate word. If the text was “Oh this this this is good”, then it will not replace 3 copies of the words at once – you’ll have to do an iteration (or recursion)… whatever u call it.

By: Kian Ann

Kian Ann — Mon, 01 Feb 2010 18:05:56 +0000

This is a great tutorial! But I don’t get the remove duplicate words thing?

return preg_replace(”/s(w+s)1/i”, “$1″, $text);

I’d assume the text is “this this”, and we “/s(w+s)1/i” is aupposed to match “this this” and replace with “this”?

Does the second part “$1″ refers to the (w+s) group? How do we match two identical words?

By: Some links for light reading (25/8/09) « Max Design

Some links for light reading (25/8/09) « Max Design — Tue, 05 Jan 2010 13:35:01 +0000

[...] Getting Started with PHP Regular Expressions [...]

By: krisha

krisha — Wed, 25 Nov 2009 15:05:27 +0000

good tutorial i improved my knowledge