Hi Simon.
The expression below seems all correct. Tested the same in 2.27 snapshot and it 
works. Which version are you on? Do you have other rules working for the same 
variable A{index_id}?

Markus

> 12. mai 2017 kl. 09.28 skrev simon mugisa <nomisrmug...@gmail.com>:
> 
> Hi there evryone,
> 
> has anybody out there been succesful with the d2:validatePattern pattern 
> program rule,
> i impliment it by:   !d2:validatePattern(A{index_id} ,'\\d{6}\/\\d{2}\/\\d')  
> which i coppied from the dhis2 user guide and added my own A{} but i get this 
> error:
>     d2:validatePattern was called with the incorrect number of parameters
> 
> my question is how many parameters are required. if they are two can someone 
> give the right format for this.
>  
>      
> Simon Robert Kununka
> DHIS2 implimentor, Analyst and Consultant
> 
> Uganda-Kampala
> Direct: + <tel:%2B1-703-667-3954>256-777-108-323
> E-mail: nomisrmug...@gmail.com <mailto:nomisrmug...@gmail.com>
> 
> 
> "Don't wish it was easier, wish you were better. Don't wish for less 
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