To edit the Field is very Complex for Date Field

[kamabhavik]

when applying date format on text-Field cursor goes to the end if you try to edit the date string in between that has already written.

[liseven]

Hello! when ' textfield.pattern = "^(?!\d_$)(?![a-zA-Z]$)[0-9a-zA-Z]{1,6}" ' in swift ,the result is ' exception 'Parse error', reason: 'Unknown group modifier @ pos 4: ^((? ▶!\d$)(?![a-zA-Z]$))[0-9a-zA-Z]{1,6}' ' . But the sentence of '^(?!\d$)(?![a-zA-Z]_$)[0-9a-zA-Z]{1,6}' is right proved by using Object-C . So can you help me resolve the problem？Thank you anyway