Regular Expression on String casusing ODK Collect to crash

Development
1

Hi there,

i have a string field with following bind.

As int can hold only upto 9 digits, that is why string type is being used.

Can regular expressions work with strings?

Regards,
Ayub

2

Hi Ayub,

I don't know if the regex engine does well with \b \d. Try something like this.

regex(., [1]{13}')

Yaw

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On Mon, Dec 16, 2013 at 9:08 PM, Ayub nrspaggregate@gmail.com wrote:

Hi there,

i have a string field with following bind.

As int can hold only upto 9 digits, that is why string type is being used.

Can regular expressions work with strings?

Regards,
Ayub

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  1. 0-9 ↩︎

3

That works great Yaw, it just missed single qoute. regex(., '^[0-9]{13}')
at the begining '^... will keep in mind not to use \b \d with ODK.

Thanks for the quick reply,

Regards,
Ayub

4

Hi Yaw,

It works for 13 or less digits, but it allows more than 13 digits. Any
ideas how can i restrict it to 13, that's why i used \b in regex.

Regards,
Ayub

5

Make sure you are using the type=string with appearance=numbers. Then
try [1]{13}$. If that fails, please file a bug with a sample form
that shows the bug.

You can also use 'string-length(.) <= 13' as a constraint but regex
should work...

Yaw

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On Wed, Dec 18, 2013 at 5:56 AM, Ayub nrspaggregate@gmail.com wrote:

Hi Yaw,

It works for 13 or less digits, but it allows more than 13 digits. Any ideas
how can i restrict it to 13, that's why i used \b in regex.

Regards,
Ayub

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  1. 0-9 ↩︎

6

Hi Ayub,

Remember to use the ^ and $ to denote begining and the end respectively.
ie. try regex(., '^[0-9]{13}$') to limit to 13 digits only.

Regards
Kihara

7

Thanks Yaw, it works perfectly now, only allows 13 digits no less no more.
I used combination of string-length(.) <= 13 and regex(., '^[0-9]{13}') as
bind constraint, that worked too but your solution is elegant.

Regards,
Ayub

8

Thank you Kihara for explaining regular expression. regex(., '^[0-9]{13}$')
works perfectly for exactly 13 digits.