Github user jjmeyer0 commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/416#discussion_r96071886
--- Diff: metron-platform/metron-common/README.md ---
@@ -39,11 +40,17 @@ The following keywords need to be single quote escaped
in order to be used in St
| <= | \> | \>= |
| ? | \+ | \- |
| , | \* | / |
+| | \* | / |
Using parens such as: "foo" : "\<ok\>" requires escaping; "foo":
"\'\<ok\>\'"
+## Stellar Language Inclusion Checks (`in` and `not in`)
+1. `in` supports string contains. e.g. `'foo' in 'foobar' == true`
+2. `in` supports collection contains. e.g. `'foo' in [ 'foo', 'bar' ] ==
true`
+3. `in` supports map key contains. e.g. `'foo' in { 'foo' : 5} == true`
+4. `not in` is the negation of the in expression. e.g. `'grok' not in
'foobar' == true`
--- End diff --
Sorry, one last comment. I was a bit curious as to how the expression
`'grok' not in 'foobar' == true` would be evaluated by Stellar. I wasn't sure
if it would be `'(grok' not in 'foobar') == true` or `'grok' not in ('foobar'
== true)`. Unfortunately when I tried to run a test it said it is not a valid
expression. I think this may be an issue in the Stellar grammar. It is probably
outside the scope of this ticket, but I thought I should mention it here.
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