How to search for 18 digit salesforce Id using regex? example : you are invited REF<18 digit SFDC ID> for the interview

Question

i cannot find answer to my question

Answer 1

Salesforce Ids are 15 or 18 characters of Base 62 data. They consist of the characters [A-Za-z0-9].

So long as your application preserves the case of the Id, the final three characters, which serve as a disambiguator for non-case-safe applications like Excel, can be ignored. Then, you can match REF<Salesforce Id> with the regex

REF[A-Za-z0-9]{15}