Allow multiple URI parameters through regex

Question

I'm pretty close from what I want to achieve.

I have this :

'/create-group/([A-Za-z0-9\-\_]+)(?:/([A-Za-z0-9\-\_]+))?(?:(\?|&)(groupid|copyofgroup|ref)=([A-Za-z0-9\-\_]+))?'

It allows me to restrain what URIs can be typed in and accessed, such as:

/create-group/123/456?groupid=789

In the last bit of the regex, I allow 3 parameters (groupid, copyofgroup and ref).

This is all good, but I can't figure out a way to have my preg_match validate an infinite number of these 3 parameters. Right now, I'm only limited to 1 instance of a parameter.

I'd like my preg_match() to accept :

/create-group/123/456?groupid=789&ref=101112&copyofgroup=789

I've tried multipliers such as * and +, but to no avail.

Thank you!

Why are you using regex and not $_GET, $_POST or $_REQUEST superglobals? — Kevin Kopf
– Kevin Kopf, Commented Jan 20, 2016 at 19:48
@Nordenheim I'm not sure what you mean? This code is place at the top-level before fetching the relevant files. I just want to restrain what parameters can be inserted in the URI. How would $_GET superglobals help me? — Justin01
– Justin01, Commented Jan 20, 2016 at 20:11
Replace [A-Za-z0-9\-\_] with [[:alnum:]_-]. Characters lose their specialness inside square braces, so you don't need to escape things with backslashes, and a dash at the either end means a dash rather than a range delimiter. And character classes just make sense. — ghoti
– ghoti, Commented Jan 20, 2016 at 20:25
@Justin01 the tags suggest you use PHP, meaning you can $_GET the needed parameters from the URI string and ignore the rest instead of crutching your way through the code. — Kevin Kopf
– Kevin Kopf, Commented Jan 20, 2016 at 20:28

Marcos Ramos · Accepted Answer · 2016-01-20 20:12:51Z

1

You can add {0,3} instead of "?", at the end:

/create-group/([A-Za-z0-9-_]+)(?:/([A-Za-z0-9-_]+))?(?:(\?|&)(groupid|copyofgroup|ref)=([A-Za-z0-9-_]+)){0,3}

I tried here: https://regex101.com/

answered Jan 20, 2016 at 20:12

Marcos Ramos

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1 Comment

Justin01 Over a year ago

Very interesting, don't know why I haven't thought of that. Thank you very much!

Justin01 · Accepted Answer · 2016-01-20 20:11:59Z

0

Found the solution :

'/create-group/([A-Za-z0-9\-\_]+)(?:/([A-Za-z0-9\-\_]+))?(?:((\?|&)(groupid|copyofgroup|ref)=([A-Za-z0-9\-\_]+))+)?'

answered Jan 20, 2016 at 20:11

Justin01

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