How to make this regular expression?

Question

I want to replace all line break (  or  ) in a string with PHP. What regular expression I should have to do this, using preg_replace?

Thanks!

Please don't use regexps to parse or modify HTML. The `` cannot hold it is too late. http://stackoverflow.com/questions/1732348/regex-match-open-tags-except-xhtml-self-contained-tags — Andrew Grimm, Apr 07 '10 at 06:13

score 3 · Answer 1 · answered Apr 07 '10 at 06:08

3

Replace |<br\s*/?>|i with "a string".

(Note that you can't parse HTML with regex even just for   — e.g. what if this   is part of a string in some inline Javascript? Use a parser to get reliable result.)

answered Apr 07 '10 at 06:08

kennytm

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score 2 · Answer 2 · edited May 23 '17 at 11:47

2

/<br[^>]*>/

Should do ... and handles   too. (If this is not a requirement, use KennyTM's solution instead. In all cases you should read his disclaimer.)

edited May 23 '17 at 11:47

Community

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answered Apr 07 '10 at 06:08

jensgram

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– Williham Totland Apr 07 '10 at 06:12
@Williham Totland, not that, no :S – jensgram Apr 07 '10 at 06:13
Using possessive quantifiers: `/
]*+>/` – Geert Apr 07 '10 at 07:13
@Geert:
Really, I can play this game all day. ;D – Williham Totland Apr 07 '10 at 08:15
@Williham: sure, you are right, but that's a problem in jensgram's version too. All I wanted to say is that if a character group (`[^>]`) can't consume the character following it (`>`), you should use possessive quantifiers to prevent possible needless backtracking. – Geert Apr 07 '10 at 09:49

Adam Kiss · Answer 3 · 2010-04-07T08:28:30.377

0

Edit:

$string = str_replace(array('<br>','<br />'),'', $string);

Oh, regex isn't ideal tool for everything

So if you decide that insisting on using preg_replace isn't meaningful anymore, you can use this

edited Apr 07 '10 at 08:28

answered Apr 07 '10 at 06:07

Adam Kiss

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I said using preg_replace, please :-) – User112312 Apr 07 '10 at 06:08
I believe OP wishes to replace all `
` AND `
` instances. – jensgram Apr 07 '10 at 06:09
@jensgram - overlooked that, ty for hu. – Adam Kiss Apr 07 '10 at 08:31

score 0 · Answer 4 · answered Apr 07 '10 at 06:54

0

check this if it helps please post back if here is any problem.

$str = 'This is a test string<br>.and another string <br>that will replace<br> with <br />';

$pattern = "/<br>/";
$replace = "<br />";
echo preg_replace($pattern, $replace, $str);

answered Apr 07 '10 at 06:54

Taha

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How to make this regular expression?

4 Answers4