Perl-regex: Difference between revisions
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#REDIRECT [[Regular_expressions_with_Perl]] |
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__NOTOC__ |
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= Perl Regex = |
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== Search and replace a word or phrase == |
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* '''All matches''' |
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<pre><nowiki> |
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perl -pi -e 's/old string/new string/g' /path/to/the/file |
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</nowiki></pre> |
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This command line replaces all the instances of ''old string'' with ''new string'' that are found in `/path/to/the/file`. To replace only the first instance, remove the ''g ''at the end of the command. |
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* '''Conditional match''' |
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<pre><nowiki> |
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perl -pi -e 's/old string/new string/ if m/my unique string/' /path/to/the/file |
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</nowiki></pre> |
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This command line search only for the lines that matches ''my unique string'' and then replaces ''old string'' with ''new string'' |
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* '''Search and replace using bash shell variables''' |
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<pre><nowiki> |
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sed -ie s%old string%$BASH_VARIABLE% /path/to/the/file |
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</nowiki></pre> |
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In order to get this done is convenient to use `sed` instead `perl` command. |
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== Remove/replace a whole line == |
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* '''Conditional match''' |
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<pre><nowiki> |
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perl -pi -e '$_="" if m/my unique string/' /path/to/the/file |
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</nowiki></pre> |
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This command line removes all the lines that matches ''my unique string'' |
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Latest revision as of 23:55, 6 June 2015
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