ERB Util TAG_NAME_START_REGEXP_SET constant TAG_NAME_START_REGEXP_SET Ruby on Rails 5.2.8.1 Since v5.2.8.1 Last seen in v7.0.10 Available in: v5.2.8.1 v6.0.6 v6.1.7.10 v7.0.10 Compare with: … v6.0.6 v6.1.7.10 v7.0.10 Following XML requirements: www.w3.org/TR/REC-xml/#NT-Name
