Limited number of repetitions quantifier {n,m}

Q

What is the limited number of repetitions quantifier? How to use it?

How to write a regular expression using a repetition quantifier to ensure my password is between 8 and 12 characters long like this one: 9EA979114C?

✍: FYIcenter.com

A

The "limited number of repetitions" quantifier allows us to repeat a pattern unit at least n times, but not more than m times. The "limited number of repetitions" quantifier '{n,m}' and it needs be placed immediately after the pattern unit. For example:

Go{2,10}gle   # matches Google, Gooogle, ... Goooooooooogle

The regular expression to ensure my password is between 8 and 12 characters long:

[^ ]{8,12}

[^ ]{8,12} - repeating [^ ] from 8 to 12 times

Click the button to test this regular expression here online:

2013-01-26, 2151👍, 0💬