Extract tag from string

Question

I have a string like this:

xxx<tag1>ABC</tag1>xxxyyyzzz<tag2>MNO</tag2>zzzz<tag1>EFG</tag1>

and I need transform this into

<tag1>ABC</tag1><tag2>MNO</tag2><tag1>EFG</tag1>

I must extract tag and it's inner content only.

I search regexp what delete all the other content

$string2 = eregi_replace($reg, $string1)

You should *never* parse HTML with regex. Use [a PHP DOM parser](http://simplehtmldom.sourceforge.net/) instead. — Jay Blanchard, Nov 21 '14 at 22:49
Has no one picked up on the usage of `eregi`? Alessandro, `eregi` is depreciated.. Since PHP5.3.0, use the regular expression functions in the `preg` family: http://php.net/manual-lookup.php?pattern=preg — Daryl Gill, Nov 21 '14 at 22:51

gfcodix · Accepted Answer · 2014-11-21T22:59:14.667

2

$str = "<tag1>ABC</tag1>xxxyyyzzz<tag2>MNO</tag2>zzzz<tag1>EFG</tag1>";

preg_match_all('#<tag[0-9]>(.*?)</tag[0-9]>#i',$str,$result);

print_r($result[0]);

will output

Array
(
    [0] => <tag1>ABC</tag1>
    [1] => <tag2>MNO</tag2>
    [2] => <tag1>EFG</tag1>
)

edited Nov 21 '14 at 22:59

answered Nov 21 '14 at 22:51

gfcodix

181
5

score 1 · Answer 2 · answered Nov 21 '14 at 22:53

1

Try this:

$str = "xxx<tag1>ABC</tag1>xxxyyyzzz<tag2>MNO</tag2>zzzz<tag1>EFG</tag1>";
echo preg_replace('/(.*?)(<tag\d+>)(.*?)<\/tag\d+>(.*?)/','$2$3$4', $str);

Note: eregi is deprecated

answered Nov 21 '14 at 22:53

thecodeparadox

86,271
21
138
164

I'm shocked that no one else has mentioned the depreciation of these functions – Daryl Gill Nov 21 '14 at 22:57

Extract tag from string

2 Answers2