The term regular expressions refers to a type of search language. You'd use it to search for text strings that match certain defined patterns. So, if you need to search through a document for email addresses, IP addresses, credit card numbers, Social Security numbers, etc., you'd define a regular expression. For example, let's say that you need to search through system log files for all lines that contain a valid IP address. You'd create a regular expression that looks something like:


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Created by mogyweb 13 years 5 weeks ago
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