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I have a field wherebi need to write validation that it has 4 alpha pha numeric or 1001

 Can any one help me I want to write a formula which should allow 4 alpha numeric or it should allow  1001 series.
example AB12 or 1001
Best Answer chosen by lincy
AbhishekAbhishek (Salesforce Developers) 
Hi Lincy,

You can try the suggestions which mentioned in below blogs,



Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.