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Check existence of attributes

Hi guys,

I need to concatenate attributes in case the exists. Unfortunately if I use the the expression if(attribute_1,1,0) the softs alerts me asking me for a lost attribute.
How can I create a Working regular expression?

Thanks in advance

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mikeb

Instead of a regular expression, how about using a Branch operator. For Condition Type choose attribute_available. For Condition Value enter your attribute name. Then put your concat operator inside the Then portion of the Branch operator.

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