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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2018-11-07 12:19:29 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2018-11-07 12:20:17 +0000 |
commit | a64a253794ac64cb40befee54db53bde17dd0d49 (patch) | |
tree | c1024acc5f6e508814b944d99f112259bb28b1be /libnetdata/simple_pattern/README.md | |
parent | New upstream version 1.10.0+dfsg (diff) | |
download | netdata-upstream/1.11.0+dfsg.tar.xz netdata-upstream/1.11.0+dfsg.zip |
New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | libnetdata/simple_pattern/README.md | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/libnetdata/simple_pattern/README.md b/libnetdata/simple_pattern/README.md new file mode 100644 index 000000000..22ccf373a --- /dev/null +++ b/libnetdata/simple_pattern/README.md @@ -0,0 +1,36 @@ +## netdata 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 world 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. + |