Hi can someone help me to put this regex in a validation rule

NOT(REGEX( Video_Title__c, "[?\b(?:word)\b]?"))

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When using escape sequences like \b in regex in Salesforce, you need to add an extra backslash

so "\\]?\\b(?:word)\\b\\]?" in that REGEX() function would be syntactically correct, though perhaps not semantically correct. Perhaps you meant for that (?:word) to be (?:\\w)?

If you want to match a literal backslash, you need 4 backslashes \\\\

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