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Re: How do I do this search and replace? [message #172307 is a reply to message #172304] Sun, 13 February 2011 00:21 Go to previous messageGo to previous message
The Natural Philosoph is currently offline  The Natural Philosoph
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BootNic wrote:
> On Sat, 12 Feb 2011 13:15:44 -0800 (PST)
> "laredotornado(at)zipmail(dot)com" <laredotornado(at)zipmail(dot)com> wrote:
>
>> I'm using PHP 5. I want to search for all instances of the "\n"
>> character in my $contents variable and replace it with "\r\n".
>> However, I do not want to replace the "\n" if the character
>> immediately before is already a "\r". How would I construct such
>> a search and replace to do this?
>
> http://www.regular-expressions.info/lookaround.html#lookbehind
>
> using negative lookbehind
>
> $contents = preg_replace("/(?<!\r)\n/", "\r\n", $contents);
>
>
yeah I can intuitively see exactly what THAT does.

I feeling bored now. I'll go and learn Mandarin.
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