Basic form regex validation not allowing correct inputs when using a lookahead RegEx

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Posted on by CR7

Hi all,

Please help me with this, I have a requirement to use multiple regex to validate a mobile phone number field on a basic form within Power Pages, these are:

1 - ^(07\d{8,12}|447\d{7,11})$

2 - ^[\x00-\x7F\xA0-\xFF]+$

I am trying to use basic form metadata on the field, but have seen that it is not possible to have 2 different basic form metadata pointing at the same attribute. So, I have combined these RegEx using the following expression:

3 - ^(07\d{8,12}|447\d{7,11})(?=[\x00-\x7F\xA0-\xFF]+)$

Which has been tested and validated using regex101: build, test, and debug regex

However, in power pages even when I input a valid uk mobile number e.g. 07788899900 the error message for the metadata still shows, not allowing me to submit the form.

Am I missing something here? Does a basic form Metadata only allow a single RegEx?

Please advise

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