111111111 - Invalid
A121278237 - Invalid
7777777777 - Invalid
121263263 - Valid
111111112 - Valid
111111111 – Invalid A121278237 – Invalid 7777777777 – Invalid 121263263 – Valid 111111112 –
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111111111 - Invalid
A121278237 - Invalid
7777777777 - Invalid
121263263 - Valid
111111112 - Valid
should work. It needs a string of at least two digits to match successfully.
Explanation:
Match a digit and capture it into backreference #1:
([0-9])Assert that it’s impossible to match a string of any length (>1) of the same digit that was just matched, followed by the end of the string:
(?!\1+$)Then match any string of digits until the end of the string:
[0-9]+$EDIT: Of course, in Java you need to escape the backslash inside a string (
"\\").