java - Regular Expression to match 3 or more Consecutive Sequential Characters and Consecutive Identical Characters

Question

I need regular expressions to match the below cases.

1. 3 or more consecutive sequential characters/numbers; e.g. 123, abc, 789, pqr, etc.
2. 3 or more consecutive identical characters/numbers; e.g. 111, aaa, bbb, 222, etc.

Answer 1

I don't think you can use regex for the first case. The second case is easy though:

Pattern pattern = Pattern.compile("([a-z\d])\1\1", Pattern.CASE_INSENSITIVE);

Since \1 represents part matched by group 1 this will match any sequence of three identical characters that are either within the range a-z or are digits (d).