mentionDenotationChars if it is a special symbol regular match is not correct

[lginsane]

file path: src/utils/index

const regex = new RegExp(`^${mentionChar}|\\s${mentionChar}`, "g");
const lastMatch = (text.match(regex) || []).pop();

If I set mentionChar to "this."

mention: {
  mentionDenotationChars: ["this."]
}

expect：

actual：

Execution result：
When I type "this" and anything, it matches "this.".

I solved this problem with the following changes:

const regex = new RegExp(`^${mentionChar}|\\s${mentionChar}`, "g");

Be modified into

const new_mentionChar = mentionChar.replace(/[^a-zA-Z0-9\u4e00-\u9fa5\s]/g,"\\$&");
const regex = new RegExp( `^${new_mentionChar}|\\s${new_mentionChar}`, "g");