message: Ignore case for in bibtex grammar
diff: "name": "comment.line.at-sign.bibtex"
  },
  {
  - "begin": "((@)String)\\s*(\\{)\\s*([a-zA-Z]*)",
  + "begin": "((@)(?i:string))\\s*(\\{)\\s*([a-zA-Z]*)",
  "beginCaptures": {
  "1": {
  "name": "keyword.other.string-constant.bibtex"
  ]
  },
  {
  - "begin": "((@)String)\\s*(\\()\\s*([a-zA-Z]*)",
  + "begin": "((@)i(?i::string))\\s*(\\()\\s*([a-zA-Z]*)",
  "beginCaptures": {
  "1": {
  "name": "keyword.other.string-constant.bibtex"
  