code: function extractCursorPos(query) {
          var regInfo = query.match(CURSOR_POS_EXP);
  
          if (query.length <= 1 || !regInfo ||
                  (regInfo[1] && isNaN(regInfo[1])) ||
                  (regInfo[3] && isNaN(regInfo[3]))) {
  
              return null;
          }
  
          return {
              query:  regInfo[0],
              local:  query[0] === ":",
              line:   regInfo[1] - 1 || 0,
              ch:     regInfo[3] - 1 || 0
          };
      }
docs: Attempts to extract a line number from the query where the line number
  is followed by a colon. Callers should explicitly test result with isNaN()
  
  @param {string} query string to extract line number from
  @return {{query: string, local: boolean, line: number, ch: number}} An object with
  the extracted line and column numbers, and two additional fields: query with the original position
  string and local indicating if the cursor position should be applied to the current file.
  Or null if the query is invalid