Is there string length limitation in Custom policy value?

Question

Hi everyone,

I am working on Custom policy regular expression for ClaimType.

I use a list of values to be whitelisted as the value of RegularExpression as described below.

<Restriction>
<Pattern RegularExpression={RegularExpression} HelpText="Sign up email" />
</Restriction>

As the size of this list grows such as a 5000~6000 email list, I am concerned about whether it would throw any errors at some points, and want to avoid that situation.

Any insights into what the exact string length limit is? Or are there better solutions to whitelist this type of Claim?

Best,
Gyucheon Heo

Answer 1

Hello @Gyucheon Heo , there is not documented limit. RegularExpression values with over 10,000 characters work however you might consider moving the whitelisting to a REST API Validation Technical Profile for added maintainability and flexibility.

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