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Re: How do I do this search and replace? [message #172346 is a reply to message #172307]

Mon, 14 February 2011 09:01

Curtis Dyer
Messages: 34
Registered: January 2011

Karma:

Member

The Natural Philosopher <tnp(at)invalid(dot)invalid> wrote:

> 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?
>>
>> [url][/color]
[color=teal]>> http://www.regular-expressions.info/lookaround.html#lookbehind[/color]
[color=teal]>> [/url] [/color]
>>
>> using negative lookbehind
>>
>> $contents = preg_replace("/(?<!\r)\n/", "\r\n", $contents);

And if you want to account for CRs as EOLs, you might try:

// Don't replace when CRs precede LFs nor when LFs follow CRs
$contents = preg_replace(
'/ (?<!\r) \n | \r (?!\n) /x',
"\r\n",
$contents
);

> yeah I can intuitively see exactly what THAT does.

This really isn't all that difficult.

Like all tools, regexes have their uses where appropriate. To
outright dismiss them is unwise, in my opinion.

With regard to the OP's case, I don't claim regexes are superior
to all alternatives, but they are certainly viable and get the job
done.

<snip>

--
Curtis Dyer
<?$x='<?$x=%c%s%c;printf($x,39,$x,39);?>';printf($x,39,$x,39);?>

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[Message index]

		How do I do this search and replace? By: laredotornado@zipmail on Sat, 12 February 2011 21:15
		Re: How do I do this search and replace? By: richard on Sat, 12 February 2011 21:20
		Re: How do I do this search and replace? By: Evan Platt on Sat, 12 February 2011 22:09
		Re: How do I do this search and replace? By: sheldonlg on Sat, 12 February 2011 23:59
		Re: How do I do this search and replace? By: Tim Streater on Sun, 13 February 2011 00:08
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 00:24
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 00:40
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 01:03
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 00:58
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 00:57
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 01:14
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 01:23
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 01:29
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 01:38
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 01:54
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:00
		Re: How do I do this search and replace? By: spambait on Sun, 13 February 2011 13:16
		Re: How do I do this search and replace? By: The Natural Philosoph on Sun, 13 February 2011 13:33
		Re: How do I do this search and replace? By: me on Sun, 13 February 2011 13:45
		Re: How do I do this search and replace? By: sheldonlg on Sun, 13 February 2011 13:48
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 13:51
		Re: How do I do this search and replace? By: spambait on Mon, 14 February 2011 01:58
		Re: How do I do this search and replace? By: Denis McMahon on Mon, 14 February 2011 02:25
		Re: How do I do this search and replace? By: The Natural Philosoph on Mon, 14 February 2011 09:51
		Re: How do I do this search and replace? By: sheldonlg on Mon, 14 February 2011 12:50
		Re: How do I do this search and replace? By: Jerry Stuckle on Mon, 14 February 2011 12:58
		Re: How do I do this search and replace? By: Denis McMahon on Mon, 14 February 2011 15:34
		Re: How do I do this search and replace? By: Jerry Stuckle on Mon, 14 February 2011 17:57
		Re: How do I do this search and replace? By: spambait on Sun, 13 February 2011 01:48
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:01
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 02:05
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:13
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 02:33
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:44
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 02:49
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 02:53
		Re: How do I do this search and replace? By: me on Sun, 13 February 2011 13:32
		Re: How do I do this search and replace? By: The Natural Philosoph on Sun, 13 February 2011 13:37
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 13:53
		Re: How do I do this search and replace? By: Denis McMahon on Sun, 13 February 2011 04:16
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 04:34
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 04:50
		Re: How do I do this search and replace? By: richard on Sun, 13 February 2011 05:35
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 06:11
		Re: How do I do this search and replace? By: sheldonlg on Sun, 13 February 2011 13:19
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 13:56
		Re: How do I do this search and replace? By: Evan Platt on Sun, 13 February 2011 15:09
		Re: How do I do this search and replace? By: Jerry Stuckle on Sun, 13 February 2011 15:19
		Re: How do I do this search and replace? By: Denis McMahon on Sat, 12 February 2011 22:03
		Re: How do I do this search and replace? By: BootNic on Sat, 12 February 2011 22:51
		Re: How do I do this search and replace? By: The Natural Philosoph on Sun, 13 February 2011 00:21
		Re: How do I do this search and replace? By: Curtis Dyer on Mon, 14 February 2011 09:01
		Re: How do I do this search and replace? By: The Natural Philosoph on Mon, 14 February 2011 09:54
		Re: How do I do this search and replace? By: Erwin Moller on Mon, 14 February 2011 09:14
		Re: How do I do this search and replace? By: The Natural Philosoph on Mon, 14 February 2011 09:55
		Re: How do I do this search and replace? By: Erwin Moller on Mon, 14 February 2011 10:04
		Re: How do I do this search and replace? By: The Natural Philosoph on Mon, 14 February 2011 10:28
		Re: How do I do this search and replace? By: Curtis Dyer on Mon, 14 February 2011 10:40

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