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 cons

Answer 1

For case #2 I got inspired by a sample on regextester and created the following regex to match n identical digits (to check for both numbers and letters replace 0-9 with A-Za-z0-9):

const n = 3
const identicalAlphanumericRegEx = new RegExp("([0-9])" + "\\1".repeat(n - 1))