PHP: Check if string has format of a numbered list

Question

I want to check if a string has the format of a numbered list to format this lines correctly:

1. Something
Text
1.1. Anything
Text

Should get

<h2>1. Something</h2>
Text
<h3>1.1. Anything</h3>
Text

And so on...

I tried something like this for a preg_match:

#([\d]*\.)*\s*\K(.+?)$#s

you need to use preg_replace not preg_match. Why the first numbered text was included within <h2> and the second within <h3>? — Avinash Raj
– Avinash Raj, Commented Mar 21, 2015 at 15:08
The article-title itself has <h1>, so the content will be <h2> and <h3> — user3848987
– user3848987, Commented Mar 21, 2015 at 15:31

anubhava · Accepted Answer · 2015-03-21 16:19:39Z

1

You can use:

$str = "1. Something\nText\n1.1. Anything\nText"; 

$result = preg_replace_callback('/^\d+\.((?:\d+\.)*)\h+.+$/m', 
          function($m) {$t=($m[1]!="")?'h3':'h2'; return "<$t>$m[0]</$t>";}, $str);

Output:

<h2>1. Something</h2>
Text
<h3>1.1. Anything</h3>
Text

RegEx Demo

edited Mar 21, 2015 at 16:19

answered Mar 21, 2015 at 15:08

anubhava

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1 Comment

user3848987 Over a year ago

For deeper level I need 'higher' heading-format. 1. should get <h2> 1.1. should get <h3>.

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