iifNull with regexMatch

Question

In Azure Data mapping, I have 3 columns for telephone numbers T1, T2 & T3.

I want to create another column TelephoneNumber that would return T1 if its not null and the value is in a certain match (to actual telephone numbers) and move on to T2 if the condition isnt met and to T3 lastly.

I tried to combine iifNull with regexMatch as follow

iifNull(
regexMatch(Telephone1,(+44|0044|0|44)(7)[4-9][0-9]{8}),
regexMatch(Telephone2,(+44|0044|0|44)(7)[4-9][0-9]{8}),
regexMatch(Telephone3,(+44|0044|0|44)(7)[4-9][0-9]{8})
)

But the outcome is Boolean not the Value.

Could you help please! Thanks

Answer 1

Hello @Mohamed Mohamed ,

Thanks for the question and using MS Q&A platform.

That's becasue the RegexMatch returns boolean . I worked on the expression below that may be used at your end in the derived column transformation.

iifNull(  
    iif(  
        regexMatch(Telephone1, `(\+44|0044|0|44)(7)[4-9][0-9]{8}`),Telephone1,toString(null())  
        ),  
     iif(  
        regexMatch(Telephone2, `(\+44|0044|0|44)(7)[4-9][0-9]{8}`),Telephone2,toString(null())  
        ),  
     iif(  
        regexMatch(Telephone3, `(\+44|0044|0|44)(7)[4-9][0-9]{8}`),Telephone3,toString(null())  
        )  
)  

The idea is to match the regex - If true return the number value with column (Tx) - else move to the next column & repeat the step

Hope this will help. Please let us know if any further queries.

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