Please do the following: 1. Give me a regex statement that will look for a certain set

Please do the following:
1. Give me a reg-ex statement that will look for a certain set of characters (in this case a-z, A-Z and 0-9).
2. Give me a reg-ex statement that matches a string that has an a followed by one or more b
3. Give me a reg-ex statement that matches matches a word containing z.
4. Give me a reg-ex statement that matches string that contains only upper and lowercase letters, numbers, and underscores.
5. Give me a reg-ex statement that matches string containing these words fox, dog, horse

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