WebbA regular expression (shortened as regex or regexp; sometimes referred to as rational expression) is a sequence of characters that specifies a match pattern in text.Usually … WebbUnderstanding Regular Expressions, Special Characters, and Patterns This appendix describes regular expressions, special or wildcard characters, and patterns used with filters to search through command output. Filter commands are described in the “Filtering show Command Output” section on page 5-9. Contents • Regular Expressions, page A-1

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