Over 18 regex

[giraffemedia]

Hello, I'm trying to put together a regex that validates a two number input. I want a person to enter their age but it has to be 18 or over and up to 99.

 

I've tried using ^([1-9][8-9])$ but obviously that only validates 18, 19, 28, 29, 38, 39 etc missing out the other numbers.

 

Can anyone help please?

[trq]

You should firstly validate the data is a number using regex, then just use a simple expression to test that number is greater than 18.

[giraffemedia]

Hi Thorpe,

 

It's for a Joomla component and I haven't got a lot of control over other aspects or filtering.

 

I need a php regex that allows any number from 18-99 but nothing else.

 

James

[JAY6390]

Why would you use regex for this?

Surely it's easier to just use regular php

 

$age = (int) $_POST['age'];
if($age >= 18 && $age <= 99) {
    // Age is correct
} else {
    // Age is incorrect
}

[JAY6390]

Also, if you really want to do it via regex...you could use this, although personally I find it a bit overkill

~^(1[89]|[2-9][0-9])$~

[giraffemedia]

Why would you use regex for this?

Surely it's easier to just use regular php

 

$age = (int) $_POST['age'];
if($age >= 18 && $age <= 99) {
    // Age is correct
} else {
    // Age is incorrect
}

Hi Jay, if you read my 2nd post you'll see I can only enter a regex for validation.

[JAY6390]

Ah OK, I skipped that post sorry. my regex above should work

[xyph]

JAY6390's example will only be true for values less than 100.

 

^(?:[1-9]\d{2,}+|[2-9]\d|1[89])$

 

The first section checks for 1-9 followed by 2 or more digits. This covers all numbers greater than 99

The second checks for a number between 2-9 followed by a single number. This covers all two digit numbers over 19

The final checks for a 1 followed by either an 8 or a 9. This covers 18 and 19.

 

The RegEx doesn't allow leading 0's, but this could be checked fairly easily by adding something like 0*+ immediately after the opening ^.

 

Hope this helps.

 

[JAY6390]

I want a person to enter their age but it has to be 18 or over and up to 99

This is why my solution stops at 99 

[xyph]

Guess I should read. Oh well... knowledge is power... MY POST IS JUSTIFIED!