正则表达式检查任何字符超过两次

Question

I'm looking for a simple regular expression to match same character in the string more than two times likes following in java script. (Number 1 is three times) 112561

Answer 1

You could check if a group is more than tow times in the array.

 console.log(/(.).*\1.*\1/.test('12561')); console.log(/(.).*\1.*\1/.test('112561'));

Answer 2

The following regex can be used for this purpose:

.*(.).*\1.*\1.*

Answer 3

This will check if a character is repeated more than 2 times in a string. Note that this also does not use * which is a cause for performance issues in JavaScript.

 console.log(/.+?(.)((?:.)+?\1){1,}/.test('abcZdefZghiZ')) console.log(/.+?(.)((?:.)+?\1){1,}/.test('112561')) console.log(/.+?(.)((?:.)+?\1){1,}/.test('12561'))