![]() ![]() In order to specify the intended pattern as an extended regular expression, the ‘ -e‘ or ‘ -extended-regexp‘ can be used. The pipe symbol isn’t supported as an alternation operator and as such the escape ( backslash) character is required to tell grep to instruct pipe differently. This regular expression – ‘ first pattern\|second pattern‘ – should always be enclosed in single quotes. The ‘ first pattern‘ and ‘ second pattern‘ would be replaced by the potential patterns you’re searching for. As such, in order to search for multiple patterns, the input would be: $ grep 'first pattern\|second pattern' filename It will enable the user to specify all potential matches, whether they are expression sets or literal strings. ![]() If you wish to search for multiple patterns, you can use the OR operator, referred to as the alternation operator. If no regular expression syntax is specified, the GNY grep will set the search patterns as basic expressions. These can be specified as Basic, Extended or Perl-compatible. The grep utility is suitable for three expression syntaxes. It then returns results by writing each line for standard output. In essence, it will search input files looking for lines that are a match to a certain regular expression. Grep stands for Global Regular Expression Print. When we refer to grep, we’re talking about the command-line function. You can find full examples of the commands used to accomplish this below. This guide explains how to use the grep utility for searching multiple words, strings, and patterns. ![]()
0 Comments
Leave a Reply. |