'Dialogflow: Regex checkbox missing from options?

I wanted to add an entity and test it using RegEx. I'm looking at examples, and everyone has the ability to check the RegEx box, but that's missing on my interface.

Why is that?

Here's my screen: missing regex box



Solution 1:[1]

I had the same issue, logging out of the Dialogflow and logging in again fixed the problem for me.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Hamidd Hosseini