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Evaluate Expression Left

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I try to use evaluate expression but I found one problem


We use: LEFT($RV_DNIS,4) and want to recognize prefix (alphanumeric)


Using LEFT(221602937,4) we receive right result: 2216

But using for LEFT (CD17221602937,4) we receive empty result.


Can You help me WHY?

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Please use quote characters around the input string. ie:




also a good idea to have the quotes around any result variable expressions that should be treated as strings. eg:



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