String, Batch Add Thousands Separators

// GraalJS Script (engine type: 2)

//////// START "main()" /////////////////////////////////////////////////////////////////
main();
function main(){ 

//// == Config Retrieving / 工程コンフィグの参照 ==
const strInput        = configs.get( "StrConfA" );          /// REQUIRED ///////////
  if( strInput      === "" ){
    throw new Error( "\n AutomatedTask ConfigError:" +
                     " Config {A: String} is empty \n" );
  }
const strSeparator    = configs.get( "SelectConfB" );       /// REQUIRED ///////////
  engine.log( " AutomatedTask Config: Separator: " + strSeparator );
const strPocketOutput = configs.getObject( "SelectConfC" ); /// REQUIRED ///////////


//// == Data Retrieving / ワークフローデータの参照 ==
// (Nothing. Retrieved via Expression Language in Config Retrieving)


//// == Calculating / 演算 ==
let strOutput;
if( strSeparator === "comma" ){
    strOutput = strInput.replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,'); // supports zh ja
    // scripts consistently written without punctuation to separate words
    // strOutput = strInput.replace(/\B(?=(\d{3})+(?!\d))/g, ','); // non-word boundary
}else if( strSeparator === "dot" ){
    strOutput = strInput // 'dot' sign is used to separate decimal places in JavaScript
                .replace(/(\d)\.(?=\d)/g, '$1,')
                .replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1.');
}else if( strSeparator === "space" ){
    strOutput = strInput
                .replace(/(\d)\.(?=\d)/g, '$1,')
                .replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1 ');
}


//// == Data Updating / ワークフローデータへの代入 ==
engine.setData( strPocketOutput, strOutput );


} //////// END "main()" /////////////////////////////////////////////////////////////////

/*
Notes:
- When the process reaches this automated task, the string data will be converted.
    - Numeric characters with more than 4 digits (4 characters) will be replaced.
    - This would also apply to postal codes, phone numbers, and the year (2022).
- For example, strings such as "Total Report" or "Summary TSV" will be easier to read.


APPENDIX:
JavaScript Numeric literals A decimal point (".")
- Input Sample: `$12345678.90`
    - Output: `$12,345,678.90`
- Input Sample: "€12345.00`
    - Output: `€12,345.00`
- Input Sample: `12345678.90123`
    - Output: `12,345,678.90,123` (not good)
- Input Sample: `0120-345-678`
    - Output: `0,120-345-678` (not good)
- Implementation of regular expression replacement (comma added)
    - Add digit separator `","`.
    - `.replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,')`
        - Replace all "{number}" with "{number},".
        - But only if immediately followed by the pattern `(\d{3})+(?!\d)`
            - `(\d{3})`: three numeric characters
            - `(?!\d)`: non-numeric character
- Implementation of regular expression replacement (period => comma)
    - Replace the decimal period (JavaScript literal) with a comma
    - `.replace(/(\d)\.(?=\d)/g, '$1,')`
        - Replace all "{number}." will be replaced with "{number},".
        - But only if immediately followed by `\d` (Lookahead assertion)
    - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Assertions


Notes-ja:
- 案件がこの自動処理工程に到達した際、文字列（複数行/単一行）を自動的に変換します。
    - 4桁以上（4文字以上）の数字文字列が置換されます。
    - 郵便番号、電話番号、西暦（2022年）などにも適用されてしまいます。
- たとえば、自動生成された「合計値レポート」や「売上集計TSV」を読みやすくします。

APPENDIX-ja:
- サンプル
    - Input: `$12345678.90`
    - Output: `$12,345,678.90`
    - Input: "€12345.00`
    - Output: `€12,345.00`
    - Input: `12345678.90123`
    - Output: `12,345,678.90,123` (not good)
    - Input: `0120-345-678`
    - Output: `0,120-345-678` (not good)
- 正規表現による置換の実装（カンマ追加）
    - 桁区切り記号〔,〕を追加
    - `.replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,')`
        - 全ての『{数字}』を『{数字},』に置換します。
        - ただし、その直後に `(\d{3})+(?!\d)` のパターンが続く場合のみ（先読み言明）
            - `(\d{3})`: 数字3文字
            - `(?!\d)`: 数字以外の文字
- 正規表現による置換の実装（ピリオド⇒カンマ）
    - 小数点ピリオド〔JavaScript リテラル〕をカンマに置換
    - `.replace(/(\d)\.(?=\d)/g, '$1,')`
        - 全ての『{数字}.』を『{数字},』に置換します。
        - ただし、その直後に `\d`（数字）が続く場合のみ（先読み言明／Lookahead assertion）
    - https://developer.mozilla.org/ja/docs/Web/JavaScript/Guide/Regular_Expressions/Assertions
*/