preg_replace, negate regex pattern

Question

This is my pattern which i want to negate:

[\+\-][0-9\.]+

These are sample rows:

Stephane Robert (+1.5 Sets)
Stephane Robert (-1.5 Sets)
Philipp Kohlschreiber
Philipp Kohlschreiber (-1.5 Sets)
Philipp Kohlschreiber (+1.5 Sets)
Player Names (n)
Another Player-Player

I want to strip all but the numbers, matching the pattern, i.e. i want only the positive or negative float number.

+1.5
-1.5
-1.5
+1.5

I'm using php and preg_replace.

Thanks!

score 1 · Answer 1 · answered Oct 27 '16 at 08:58

1

If you want to find strings that match your pattern, just use preg_match() instead of preg_replace().

answered Oct 27 '16 at 08:58

Bartosz Zasada

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3

This should be a comment. – Toto Oct 27 '16 at 09:03
1

And `preg_match` won't do the job since there are multiple values to extract. – Wiktor Stribiżew Oct 27 '16 at 09:24
Useful version, thanks, but i have to use preg_replace for some reason. – NTsvetkov Oct 27 '16 at 10:10

Mustofa Rizwan · Accepted Answer · 2016-10-27T09:29:44.223

0

You can use this. This will also remove other lines which doesn't have the desired value.

(?=.*[+-]\d+\.\d+).*([+-]\d+\.\d+).*|(.*)

Explanation

PHP Code sample

$re = '/(?=.*[+-]\d+\.\d+).*([+-]\d+\.\d+).*|(.*)/m';
    $str = 'Stephane Robert (+1.5 Sets)
    Stephane Robert (-1.5 Sets)
    Philipp Kohlschreiber
    Philipp Kohlschreiber (-1.5 Sets)
    Philipp Kohlschreiber (+1.5 Sets)
    Player Names (n)
    Another Player-Player';
    $subst = '\\1';

    $result = preg_replace($re, $subst, $str);

    echo $result;

edited Oct 27 '16 at 09:29

answered Oct 27 '16 at 09:12

Mustofa Rizwan

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Why downvoted ? would like to know the reason to enhance the answer – Mustofa Rizwan Oct 27 '16 at 12:03

preg_replace, negate regex pattern

2 Answers2