grep « String « Ruby

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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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