Explicit count modifiers for regex

The construction `{,2}` in regular expressions is only supported by Onigurma (which is used by TextMate). This TextMate bundle is used to highlight D code on GitHub. However, GitHub is using a [PCRE-based engine](https://github.com/vmg/pcre) for regexes and thus, the following code gets incorrectly highlighted.
```d
const MAPI_LOGON_UI = \00;
```

This pull request fixes that by using an explicit count modifier in the regex.