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I have a flow field (phone_private) and I want to validate if this field only contain numbers. I tried REGEX({!phone_private}, "[0-9 ]+") but the rule fires also if the field contain numbers. If I changed the rule to NOT(REGEX({!phone_private}, "[0-9 ]+")) the rule doesn't fire. What is wrong with the rule?

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You want to check if it contains non-numbers, so that's what you need to do. The rule should look like:

REGEX({!phone_private}, "[^0-9 ]+")

The ^ operator at the beginning of a character class inverts the character matching, so only 0 through 9, and space, would be allowed.

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