Regular expressions teach class

Here are some regular expressions constructed that I use everyday. These are tested in C#:

1. Matching any character: [abc]
2. Matching any word: b[^ "]*b
3. "" matching: "[^"]*"
4. More advanced “” matching: "(\"|[^"])*"
5. /**/ comments matching: /*[^*]**+([^/*][^*]**+)*/
6. Matching HTML elements: <[^<^>]*>
7. Matching CSS {} content: {[^{]*}