Regular Expression on String casusing ODK Collect to crash

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

Hi Ayub,

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

regex(., ^[0-9]{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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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

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

Make sure you are using the type=string with appearance=numbers. Then
try ^[0-9]{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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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

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

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