A regular expression is a formula for matching strings that follow a pattern consisting of normal characters or metacharacters mixed with normal characters. Regular expressions are an effective way of specifying complex search operations. They use special character operators, which are symbols that control the search, and an expression, which is a combination of characters and operators that specifies a pattern.
Normal characters include uppercase and lowercase letters and digits. Metacharacters are symbols and expressions that have special meaning.
Example: Find All Occurrences of the String "test"
A regular string of characters matches the same string of characters in the item being searched. You can search for all occurrences of the string "test" by using the regular expression "test". This string will also match "testing" and "latest" but not "Test".
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