![]() In this example, we’ll search /etc/nf where character ‘ t‘ precedes character ‘ a.’ # grep "t+a" /etc/n Display content in the /etc/nf where character ‘t’ precedes character ‘a. Linux comes with GNU grep, which supports extended regular expressions. ? - matches zero or one occurrence of the previous character A regular expression is a search pattern that grep command matches in specified. ![]() + - matches one or more occurrences of the previous character.The extended regular expression contains more than one expression. ![]() Extended Regular ExpressionsĪn Extended Regular Expression ( ERE) is a regular expression that contains more than one expression. By default, a pattern matches an input line if the regular expression (RE) in the pattern matches the input line without its trailing newline.
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