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-rw-r--r--spec/spec.go2
-rw-r--r--spec/spec_test.go8
2 files changed, 9 insertions, 1 deletions
diff --git a/spec/spec.go b/spec/spec.go
index 2360201..3d46269 100644
--- a/spec/spec.go
+++ b/spec/spec.go
@@ -101,7 +101,7 @@ func (m LexModeName) validate() error {
return nil
}
-const idPattern = `^[A-Za-z](_?[0-9A-Za-z]+)*$`
+const idPattern = `^[a-z](_?[0-9a-z]+)*$`
var idRE = regexp.MustCompile(idPattern)
diff --git a/spec/spec_test.go b/spec/spec_test.go
index 54d7b7d..e0e920e 100644
--- a/spec/spec_test.go
+++ b/spec/spec_test.go
@@ -22,6 +22,14 @@ var idTests = []struct {
id: "f_o_o",
},
{
+ id: "Foo",
+ invalid: true,
+ },
+ {
+ id: "foo_Bar",
+ invalid: true,
+ },
+ {
id: "2foo",
invalid: true,
},