Method parseRegexGroup

static/katex/katex.mjs:15483–15502

* Parses a regex-delimited group: the largest sequence of tokens * whose concatenated strings match `regex`. Returns the string * formed by the tokens plus some position information.

(regex, modeName)

  parseRegexGroup(regex, modeName) {
    const outerMode = this.mode;
    this.mode = "text";
    const firstToken = this.nextToken;
    let lastToken = firstToken;
    let str = "";

    while (this.nextToken.text !== "EOF" && regex.test(str + this.nextToken.text)) {
      lastToken = this.nextToken;
      str += lastToken.text;
      this.consume();
    }

    if (str === "") {
      throw new ParseError("Invalid " + modeName + ": '" + firstToken.text + "'", firstToken);
    }

    this.mode = outerMode;
    return firstToken.range(lastToken, str);
  }
  /**
   * Parses a color description.
   */