I'm using the following regular expression to validade emails

```
^\w+([-.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$
```

Now I want to modify this regular expression to validade the email length using {5,100}, how can I do that?

Thank you.

```
^(?=.{5,100}$)\w+([-.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$
```

I'm using the zero-width lookahead. It won't consume characters, so you can then recheck them with your expression.

Be careful. This is a relatively weak expression, matches even *user@server.com.net.org*. Email regexes were already discussed in many other questions like this one.

Checking for the length of a string can generally be done within the language/tool you're using. This might be even faster in some cases. As an example (in Perl):

```
my $len = length $str;
if ($len < 5 || $len > 100) {
# something is wrong
}
```

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