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diff --git a/libnetdata/simple_pattern/README.md b/libnetdata/simple_pattern/README.md deleted file mode 100644 index 5f56a3af7..000000000 --- a/libnetdata/simple_pattern/README.md +++ /dev/null @@ -1,47 +0,0 @@ -<!-- -title: "Simple patterns" -description: "Netdata supports simple patterns, which are less cryptic versions of regular expressions. Use familiar notation for powerful results." -custom_edit_url: https://github.com/netdata/netdata/edit/master/libnetdata/simple_pattern/README.md -sidebar_label: "Simple patterns" -learn_status: "Published" -learn_topic_type: "Tasks" -learn_rel_path: "Developers/libnetdata" ---> - -# Simple patterns - -Unix prefers regular expressions. But they are just too hard, too cryptic -to use, write and understand. - -So, Netdata supports **simple patterns**. - -Simple patterns are a space separated list of words, that can have `*` -as a wildcard. Each word may use any number of `*`. Simple patterns -allow **negative** matches by prefixing a word with `!`. - -So, `pattern = !*bad* *` will match anything, except all those that -contain the word `bad`. - -Simple patterns are quite powerful: `pattern = *foobar* !foo* !*bar *` -matches everything containing `foobar`, except strings that start -with `foo` or end with `bar`. - -You can use the Netdata command line to check simple patterns, -like this: - -```sh -# netdata -W simple-pattern '*foobar* !foo* !*bar *' 'hello world' -RESULT: MATCHED - pattern '*foobar* !foo* !*bar *' matches 'hello world' - -# netdata -W simple-pattern '*foobar* !foo* !*bar *' 'hello world bar' -RESULT: NOT MATCHED - pattern '*foobar* !foo* !*bar *' does not match 'hello world bar' - -# netdata -W simple-pattern '*foobar* !foo* !*bar *' 'hello world foobar' -RESULT: MATCHED - pattern '*foobar* !foo* !*bar *' matches 'hello world foobar' -``` - -Netdata stops processing to the first positive or negative match -(left to right). If it is not matched by either positive or negative -patterns, it is denied at the end. - - |