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I need to validate that telephone numbers are entered in this format:
###-###-####. I found something that was close: =AND(LEFT(A2,1)="C",LEN(A1)=16,ISNUMBER(SUBSTITUTE (RIGHT(A2,14),"-","")*1),LEN(SUBSTITUTE(RIGHT(A2,13),"-",""))=12) ( it validates this format: C-###-#####-####. But I have not been able to successfully adapt the above to what I need. Any help would be appreciated. |
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