PHP regex matching <html> tag with optional attributes

Question

I'm trying to match <html> tag with optional attributes and to extract those attributes. I want to match one of the following variations of <html> tag. It would be the starting content of a HTML document or there may be DOCTYPE declaration before <html>.

<html>
<html lang="en">
<html class="my-class">
<html class="my-class" lang="en">

The regular expression pattern I'm trying is as below, but it is only matching the last attribute lang="en" for the fourth case.

/<html(\s+([a-z\-]+)=('|")([^"'>]*)('|"))*>/i

Demo

I know that some suggest to use DOM parser instead of regular expression. But I think regular expression is enough for my case as I want to match <html> tag only.

@AvinashRaj No problem of it. We can add ^ at the start of the pattern. — Sithu
– Sithu, Commented Jan 17, 2015 at 4:58

Community · Accepted Answer · 2017-05-23 11:50:56Z

3

Use the below regex and then get the attribute value pair from group index 1 and 3.

(?:<html|(?<!^)\G)\h*(?:([^=\n\h]+)=(['"])((?:\\\2|(?!\2).)*)\2)?

\G reference.

DEMO

edited May 23, 2017 at 11:50

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answered Jan 17, 2015 at 5:06

Avinash Raj

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11 Comments

Sithu Over a year ago

Thanks. But I want to match <html> without attributes (the first case) too. I want to manipulate especially the values of the attributes class and lang and leave the other attributes as they are. If there is class, I want to append its value and if there is no class, I want to add class.

A l w a y s S u n n y Over a year ago

Sir, how to be a regex master like you, please give some advise. @AvinashRaj

Sithu Over a year ago

@AvinashRaj Awesome! Upvoted. It is better to extract the attribute name and value separately so that the further process on the result could be easy without using string manipulation.

Avinash Raj Over a year ago

@BeingHuman it's so simple. I started to learn regex (80%) a few months before (approx 10 months). This site teaches me about regex. People here a really awesome. I learned few things from the regex gurus (from SO). Some people clears my doubts. I want to be a person from that some people. Yep, you could ask me any doubts in regex by commenting below my posts.

Avinash Raj Over a year ago

@Sithu get the attribute from index 1 and value from 3 regex101.com/r/kG5vF1/4

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