RegularExpression
 Usage
Notes
 Further Examples
This finds all cases of the character "a" followed by any character.
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This uses parentheses to assign the character following "a" to pattern number  . This pattern can be referred to as "$1" on the right hand side.
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This picks out words containing a double letter.
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This capitalizes the first letter in each word. Notice the use of  so that ToUpperCase does not evaluate before the matching has occurred.
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This find all numbers in a string that are not preceded by a word character (negative lookbehind).
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