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Introduction to Regular Expression for sed & awk

Introduction to Regular Expression for sed & awk. by Susan Lukose. Regular Expression. Regular Expression way to match text with patterns. Regular Expression. {n}    Match exactly n times {n,}   Match at least n times { n,m }  Match at least n but not more than m times.

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Introduction to Regular Expression for sed & awk

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  1. Introduction to Regular Expression for sed & awk by Susan Lukose

  2. Regular Expression • Regular Expression way to match text with patterns

  3. Regular Expression • {n}    Match exactly n times {n,}   Match at least n times {n,m}  Match at least n but not more than m times

  4. Regular Expression • Grouping could be done with () • (ab) • gg(ab)*gg • Class could be specified [] • [abc] Match any of a, b, and c. • [a-z] Match any character between a and z. (ASCII order) • [^abc] A caret ^ at the beginning indicates "not". In this case, match anything other than a, b, or c. • regular expression should be specified between // • Special characters like ^, $, . etc.. Could be matched by escaping with \

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