Problem validating a field value for a transition

[GaryBilton]

I am trying to restrict a workflow transition so that it can only happen when a field's value begins with an R (the full value can be R or I followed by a number e.g. R1234, I543). The field type is a text field (read only). 

The rule type I am trying to use is "Validate a field"

Validate that Field > Matches regular expression

For this Field >  I/R+Number

Expression >  this is where I am having trouble! 

I have tried all sorts of variations of R, ^R\d, ^R/d$,  R+[0-9], R[0-9] and every time I get Transition failed  Field I/R+Number with actual value' R458' does not match regular expression (whatever I've entered)

Am I doing this completely wrong, or have I just got my syntax wrong?

Many Thanks!  

[Stephen_Lugton · Accepted solution]

Hi @GaryBilton 

Regex is not my speciality, but it looks like all the examples you've given are for R + one digit, which would not match against R458 (which is R + three digits), have you tried something like

^R\d{1,5}$

This should give you R + one to five digits

[Stephen_Lugton]

and on testing, that worked against a field with R458, but failed the regex when I used I458

[GaryBilton]

Hi @Stephen_Lugton 

That works a treat! I knew I was doing something wrong! 

Thanks for the help 

Gary

[Valerie Knapp]

Hi @GaryBilton , welcome to the Atlassian Community and thanks for your post.

I found this in the documentation https://confluence.atlassian.com/jirakb/using-forms-regex-validation-1255454685.html 

Does that help at all ^?

Best wishes

[GaryBilton]

Thanks Valerie, That was the document I was working from. From that and the examples that are shown under the rule when you enter it I can't see why  R[0-9] or ^R\d don't work. Either I'm entering it incorrectly or I'm using the wrong type of validation.