Merge pull request #7934 from influxdata/jl-regex-case#7906

regex: don't use exact match for case insensitive expression

CHANGELOG.md

@@ -6,6 +6,7 @@
 - [#7888](https://github.com/influxdata/influxdb/pull/7888): Expand query dimensions from the subquery.
 - [#7910](https://github.com/influxdata/influxdb/issues/7910): Fix EvalType when a parenthesis expression is used.
 - [#7929](https://github.com/influxdata/influxdb/issues/7929): Fix series tag iteration segfault. (#7922)
+- [#7906](https://github.com/influxdata/influxdb/issues/7906): Anchors not working as expected with case-insensitive regex
 
 ## v1.2.0 [2017-01-24]
 

cmd/influxd/run/server_test.go

@@ -5542,6 +5542,12 @@ func TestServer_Query_With_EmptyTags(t *testing.T) {
 			command: `select value from cpu where host =~ /^server01$/`,
 			exp:     `{"results":[{"statement_id":0,"series":[{"name":"cpu","columns":["time","value"],"values":[["2009-11-10T23:00:03Z",2]]}]}]}`,
 		},
+		&Query{
+			name:    "where regex exact (case insensitive)",
+			params:  url.Values{"db": []string{"db0"}},
+			command: `select value from cpu where host =~ /(?i)^SeRvEr01$/`,
+			exp:     `{"results":[{"statement_id":0,"series":[{"name":"cpu","columns":["time","value"],"values":[["2009-11-10T23:00:03Z",2]]}]}]}`,
+		},
 		&Query{
 			name:    "where regex exact (not)",
 			params:  url.Values{"db": []string{"db0"}},

influxql/ast.go

@@ -1369,7 +1369,7 @@ func matchExactRegex(v string) (string, bool) {
 
 	if len(re.Sub) == 3 {
 		middle := re.Sub[1]
-		if middle.Op != syntax.OpLiteral {
+		if middle.Op != syntax.OpLiteral || middle.Flags^syntax.Perl != 0 {
 			// Regex does not contain a literal op.
 			return "", false
 		}