PHP Regex to match an IP address

Question

On PHP question: From string "192.168.0.23, 192.168.2.33, 124.125.126.127" remove IP address ", 124.125.126.127". leave only: "192.168.0.23, 192.168.2.33"

Thank you.

Very "smart" way to do your homework – Your Common Sense Apr 04 '14 at 16:12 — Your Common Sense, Apr 04 '14 at 16:12
`$string = "192.168.0.23, 192.168.2.33";` will do the job. – Toto Apr 04 '14 at 16:30 — Toto, Apr 04 '14 at 16:30

Amit Joki · Accepted Answer · 2014-04-04T17:31:39.427

1

Use this regex: /[\w.]{15}/ and replace with nothing or empty string "".

<?php
$string = '192.168.0.23, 192.168.2.33, 124.125.126.127';
$pattern = '/[\d.]{15}/';
$replacement = '';
echo preg_replace($pattern, $replacement, $string);
?>

Then, remove the last comma with some native php string function. (I don't know much about php)

Demo: http://ideone.com/xNCVNC

edited Apr 04 '14 at 17:31

answered Apr 04 '14 at 16:16

Amit Joki

58,320
7
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`abc.def.hij.klm` matches your regexp. – maček Apr 04 '14 at 17:28

score 0 · Answer 2 · edited Jun 20 '20 at 09:12

0

A regex free solution

<?php
$str='192.168.0.23, 192.168.2.33, 124.125.126.192';
print_r(array_filter(explode(', ',$str),function ($v){  return substr($v,0,3)=='192'?$v:''; }));

Working Demo

OUTPUT :

Array
(
    [0] => 192.168.0.23
    [1] => 192.168.2.33
)

edited Jun 20 '20 at 09:12

Community

1
1

answered Apr 04 '14 at 16:25

Shankar Narayana Damodaran

68,075
43
96
126

PHP Regex to match an IP address

2 Answers2

A regex free solution