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Laura GilLaura Gil 

Can somebody please explain me what this REGEX validation means?

Hi all,
I am trying to build a validation rule with REGEX for the field Phone. The validation rule should check the following:
Allow: Numbers
Allow: Characters such as '+', spaces, parenthesis '(', ')', '/', '-'
Allow: Character '+' should be only at the beginning of the phone number not in the middle or at the end
So, just searching pages with REGEX tutorials but unfortunately I could not find any appropriate in order to also decrypt the following expression literally:
NOT(REGEX(Phone,"(\\D?[0-9]{3}\\D?)[\\s][0-9]{3}-[0-9]{4}") )
No idea what do the following do?:
\\D? (at the beginning and at the end)
I would appreciate if experts in REGEX could give me some guidance here. 
Sai PraveenSai Praveen (Salesforce Developers) 
Hi Laura,

Please find the below article which gives you explanantion for each and every characters that we use in REGEX formula.



If this solution helps, Please mark it as best answer.