Classic ASP Regular Expressions

Question

I am trying to validate a querystring coming from an email activation link, written in Classic ASP.

The querystring input contains numbers, letters and 2 forward slashes. Like this: G3hEus87YK/6738/HE347sxThH and I need to validate it, checking that only numbers, letters and slashes have been used.

The numbers in between the slashes could be 1-9 digits long, here I used 4 as an example but there are always 10 alphanumerical characters before the slash and 10 after.

I have done this so far, that will run the check, but I'm not sure which pattern to give it!

Function validateToken(token) 
  Set regEx = New RegExp 
  regEx.IgnoreCase = True
  regEx.Pattern = "???????????" 
  validateToken = regEx.Test(Trim(Request.QueryString("token"))) 
End Function

My attempt for numbers and letters only would be, [A-z][0-9] , but looking for 2 slashes confuses me. How can I look for slashes too?

I suppose if I wrote the pattern in pure English, it would read:

10 alphanumerical characters, any case.
A forward slash
Numbers, 1-9 digits long
A forward slash
10 alphanumerical characters, any case.

score 1 · Accepted Answer · answered Nov 24 '11 at 17:58

1

"there are always 10 alphanumerical characters before the slash and 10 after"

Ten alphanumerical characters are [a-z\d]{10}, assuming that IgnoreCase is enabled.

"The numbers in between the slashes could be 1-9 digits long"

That would be \d{1,9}, so the final pattern is fairly simple:

regEx.Pattern = "^[a-z\d]{10}/\d{1,9}/[a-z\d]{10}$"

The ^ and $ disallow anything before or after the pattern.

answered Nov 24 '11 at 17:58

Tomalak

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"^[a-z\d]{10}/\d{1,9}/[a-z\d]{10}$" This pattern wont allow any capital alphabet, so please consider it, thanks – Elias Hossain Nov 24 '11 at 18:12
@Md.EliasHossain This is nonsense. Read my answer again, and look at his code. – Tomalak Nov 24 '11 at 18:16
Oh! Yes I understand that you assumed IgnoreCase is enabled, I'm very sorry and pardon me please, thanks for your valuable time. – Elias Hossain Nov 24 '11 at 18:20
@MdEliasHossain: No need to apologize. ;-) – Tomalak Nov 24 '11 at 18:22
i'm new on regEx and asp. The character \d what it means? – Andrea_86 Jul 23 '15 at 13:12

score 1 · Answer 2 · answered Nov 24 '11 at 18:06

1

Please try with below expression:

^(([A-z\d]{10})/(\d{1,9})/([A-z\d]{10}))$

answered Nov 24 '11 at 18:06

Elias Hossain

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Classic ASP Regular Expressions

2 Answers2