Regex replace space in string

Question

I'm messing about with the LESS PHP parser to get it to replace 4 colour hex codes found in IE filters. What I want to do is replace stuff like this: #ff7755 33 with #ff775533 ie. remove all the spaces in it. Obviously the characters can vary as they're colour codes. I found this question which is very close to what I want.

Right now, I have this regex which finds the string just fine:

(#([0-9a-f]){6}\s[0-9a-f]{2})

All I need now is the regex to put in the replace argument of preg_replace().

can you just do a regular string replace after you have found the string? — Randy
– Randy, Commented Jun 14, 2011 at 20:20
I could, but I don't know how to do it, as the entire string needs to be passed back to a return, not just the found/replaced bit. Or did I misunderstand you here? — Bojangles
– Bojangles, Commented Jun 14, 2011 at 20:21
Might as well just $str = preg_replace("/ /", "", $str); if you already know it's definitely a valid color code. — NorthGuard
– NorthGuard, Commented Jun 14, 2011 at 20:25

dynamic · Accepted Answer · 2011-06-15 09:47:34Z

7

preg_replace('/(#[0-9a-f]{6}) ([0-9a-f]{2})/i','$1$2',$yourSource);

edited Jun 15, 2011 at 9:47

answered Jun 14, 2011 at 20:21

dynamic

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1 Comment

Bojangles Over a year ago

Thank you so much yes123! I've been struggling with this for hours - I just can't get my head around regex yet. Damn head.

Seth Robertson · Accepted Answer · 2011-06-14 20:22:42Z

2

The first example in the PHP manual would seem to be exactly what you are trying to do:

<?php
$string = 'April 15, 2003';
$pattern = '/(\w+) (\d+), (\d+)/i';
$replacement = '${1}1,$3';
echo preg_replace($pattern, $replacement, $string);
?>

Of course for you it is:

<?php
$string = '#ff7755 33';
$pattern = '/(#[0-9a-f]{6})\s([0-9a-f]{2})/i';
$replacement = '${1}$2';
echo preg_replace($pattern, $replacement, $string);
?>

answered Jun 14, 2011 at 20:22

Seth Robertson

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4 Comments

NikiC Over a year ago

No need to write ${1} instead of $1. Apart from that +1.

Seth Robertson Over a year ago

@nikic: It was copy-paste from the PHP manual. The manual needed it because it was putting the 1 in there and since it does no harm I left it alone.

NikiC Over a year ago

You are right, you can use it. I just don't like it if people add additional parentheses (or braces here). I mean, you could as well write ${'var'} instead of $var and occasionally you will indeed do so, but normally I would consider ${'var'} (or ${1}) bad style :)

Bojangles Over a year ago

I should have read harder. I missed this I think because I have no clue about regex. I'll get there one day!

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