Ranges, {min, max}

Ranges are considered "counting qualifiers" in regular expressions. This is because they specify the minimum number of matches to find and the maximum number of matches to allow. Use ranges in regex searches when a bound, or a limit, should be placed on search results. For example, the range {3,5} matches an item at least 3 times, but not more than 5 times. When this range is combined with the regex, a{3,5}, the strings "aaa", "aaaa", and "aaaaa" are successfully matched. If only a single number is expressed within curly braces {3}, the pattern matches exactly three items. For example, the regex b{3} matches the string "bbb".

Using ranges to identify search patterns.

Example 1: Match the preceding "0" at least 3 times with a maximum of 5 times.

Regex:
```
60{3,5} years
```
Matches:
```
6000 years
60000 years
600000 years
```

Doesn't Match:

60 years
600 years
6003 years
6000000 years

Example 2: Using the "." wildcard to match any character sequence two or three characters long.

Regex:
```
.{2,3}
```
Matches:
```
404
44
com
w3
```
Doesn't Match:
```
4
a
aaaa
```

Example 3: Match the preceding "e" exactly twice.

Regex:
```
be{2}t
```
Matches:
```
beet
```
Doesn't Match:
```
bet
beat
eee
```

Example 4: Match the preceding "w" exactly three times.

Regex:
```
w{3}\.mydomain\.com
```
Matches:
```
www.mydomain.com
```
Doesn't Match:
```
web.mydomain.com
w3.mydomain.com
```