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Ruby » String » grep 
1. Regular Expressions
2. match the first line just by using a word in the pattern
3. a pair of square brackets ([]) matches any character in the brackets
4. match alternate forms of a pattern using the pipe character (|)
5. Grouping uses parentheses to group a subexpression, like this one that contains an alternation
6. Anchors anchor a pattern to the beginning (^) or end ($) of a line
7. \d represents a digit; it is the same as using [0-9].
8. Similar to $, the shortcut \z matches the end of a string, not a line
9. Find out the phone number
10. ? is a repetition operator
11. The plus sign (+) operator indicates one or more of the previous pattern
12. Braces ({}) specifies the exact number of digits, such as \d{3} or \d{4}
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