Regex Matching Custom HTTP Header

Question

I have a full text of HTTP header like this:

GET /index.php HTTP/1.1
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
X-ACCESS: 123456

So I want to create a regex which checks if X-ACCESS is exists and equals to 123456, how should I write it?

EDIT: I do not need to control the value of 123456, that is as long as X-ACCESS: 123456 is presented, regex will be true.

Thanks in advance :)

Forien · Accepted Answer · 2015-03-30 08:37:01Z

2

Why regex? This will suffice:

if (stripos ($http_header_text, 'X-ACCESS: 123456') !== false) {
    echo 'Custom header is here and is good';
}

answered Mar 30, 2015 at 8:37

Forien

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9 Comments

GreenVine Over a year ago

Thanks for your answer :) Well I only want regex because it's not in the programming environment, web server instead.

Forien Over a year ago

@GreenVine you used php tag, so I assume you can use php. If yes, then can use the code above.

Avinash Raj Over a year ago

does it checks this and equals to 123456 condition?

Forien Over a year ago

@AvinashRaj ofc it does. stripos() returns true if entire X-ACCESS: 123456 is found. if there is X-ACCESS: 121212 it will return false.

Avinash Raj Over a year ago

i think op wants to check the value of X-ACCESS: with the value stored inside another variable.

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Avinash Raj · Accepted Answer · 2015-03-30 08:53:07Z

0

You could use preg_match function.

$str = <<<EOT
GET /index.php HTTP/1.1
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
X-ACCESS: 123456
EOT;
if(preg_match('~^X-ACCESS:\h*123456$~m', $str)) {

        echo "Yep, they are equal";
}

\h* will match zero or more horizontal white-space character, you could use \s* also.

edited Mar 30, 2015 at 8:53

answered Mar 30, 2015 at 8:41

Avinash Raj

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5 Comments

Forien Over a year ago

why not check for '123456' within regex already? Or why don't just check stripos or stristr?

GreenVine Over a year ago

Can you provide a regex checks 123456 within the regex like @Forien said? That is as long as X-ACCESS: 123456 is presented regex is true

Forien Over a year ago

@GreenVine the simpliest regex for that is X-ACCESS: 123456.

GreenVine Over a year ago

@Forien You are absolutely right X-ACCESS: 123456 is the simplest regex, just made it complicated :lol

Avinash Raj Over a year ago

but this X-ACCESS: 123456 regex will match also foobarX-ACCESS: 12345673647634 :lol

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