How can I match multiple sets of a regular expression pattern in the same string?

Question

I am building a regex against strings that meet the following requirements: - The string has a maximum of 5 sets of alphanumeric characters. - Each set within the string is separated by SINGLE whitespace character. For example, we can have "asa22d asdcac3" or "Asdcd234 sacasW2 sas1 s sd1" (hopefully you get the picture). So far I have: ``` ^[A-z 0-9]\s{0,1} ``` I am not using `\w` because it allows underscores. This works for one set of characters, but I need to allow five sets of the same sort of strings separated by a space. How can I do that?

Accepted Answer

You haven't said what language you are using, but this should do it for you:

```
^[A-Za-z0-9]+(\s[A-Za-z0-9]+){0,4}$
```

A word, followed by up to four instances of space-then-word.

How can I match multiple sets of a regular expression pattern in the same string?

Solution

Problem