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Re: How do I do this search and replace? [message #172302 is a reply to message #172300] Sat, 12 February 2011 22:03 Go to previous messageGo to previous message
Denis McMahon is currently offline  Denis McMahon
Messages: 634
Registered: September 2010
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On 12/02/11 21:15, laredotornado(at)zipmail(dot)com wrote:
> Hi,
>
> 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?

One or more of these may work, determining which is best for your
application is up to you, they are all variations on a theme.

$contents = preg_replace("\n","\r\n",preg_replace("\r","",$contents);

$contents = preg_replace("\n","\r\n",preg_replace("\r\n","\n",$contents);

$contents = preg_replace("\n","\r\n",preg_replace("\r+\n","\n",$contents);

$contents =
preg_replace("\n","\r\n",preg_replace("(\r+\n+)+","\n",$contents);

Rgds

Denis McMahon
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