It would be good if we can get an option to validate whether the input value is valid Telephone Format or Email Format.
I would suggest to give an ability use RegEx or an option to validate the possible different validations (such as email formats, telephone formats, ip adress etc.
We added the IsMatch function some time ago which uses Regular Expressions for string validation.
100% agee with this! How can you have a data application that can't perform custom validations! Validate() is a great function for collections to do this, but it relies on the datasource to define what is valid and doesn't allow for validation on something like submitting values for a Flow...which would be very helpful if your flow is sending emails.
I cannot speak to whether this will leverage RegEx or not, but we definitely have this on our radar to improve/extend data validation options. (Telephone number standards being a common reason for this request.)
Although this doesn't solve the telephone number formatting issue, you may find this post interesting in regards to general data validation in the meantime:
Thank you for your patience,
Any update on when this improved validation will be available?