批处理过滤loginusers.txt提取MostRecent为1的用户ID

需求说明 #

我需要用批处理过滤loginusers.txt文件：如果文件中某个{ }块内存在"MostRecent" "1"，就提取该块外的"76561199048621574"这类SteamID字符串，去掉引号后赋值给变量；如果"MostRecent"为"0"，则忽略对应的整个{ }块。

文件内容示例：

"users"
{
    "76561199048621574"
    {
        "AccountName"       "acc1_internalname"
        "PersonaName"       "acc1_displayname"
        "RememberPassword"      "1"
        "WantsOfflineMode"      "0"
        "SkipOfflineModeWarning"        "0"
        "AllowAutoLogin"        "1"
        "MostRecent"        "1"
        "Timestamp"     "1660477659"
    }
    "76561198832716662"
    {
        "AccountName"       "acc2_internalname"
        "PersonaName"       "acc2_displayname"
        "RememberPassword"      "0"
        "WantsOfflineMode"      "0"
        "SkipOfflineModeWarning"        "0"
        "AllowAutoLogin"        "0"
        "MostRecent"        "0"
        "Timestamp"     "1650761551"
    }
}

批处理脚本代码 #

@echo off
setlocal enabledelayedexpansion
set "targetID="
set "currentID="
set "inUserBlock=0"
set "braceLevel=0"

for /f "usebackq tokens=* delims=" %%a in ("loginusers.txt") do (
    set "line=%%a"
    :: 匹配独立的SteamID行（带引号的纯数字串）
    echo !line! | findstr /r /c:"^[ \t]*\"[0-9][0-9]*\"[ \t]*$" >nul
    if not errorlevel 1 (
        set "currentID=!line!"
        :: 移除引号、空格和制表符
        set "currentID=!currentID:"=!"
        set "currentID=!currentID: =!"
        set "currentID=!currentID:	=!"
        set "inUserBlock=0"
        set "braceLevel=0"
    )
    :: 匹配左大括号，跟踪层级
    echo !line! | findstr /r /c:"^[ \t]*{[ \t]*$" >nul
    if not errorlevel 1 (
        set /a braceLevel+=1
        if !braceLevel! equ 1 (
            set "inUserBlock=1"
        )
    )
    :: 匹配右大括号，退出用户块
    echo !line! | findstr /r /c:"^[ \t]*}[ \t]*$" >nul
    if not errorlevel 1 (
        set /a braceLevel-=1
        if !braceLevel! equ 0 (
            set "inUserBlock=0"
        )
    )
    :: 在用户块内检查MostRecent是否为1
    if !inUserBlock! equ 1 (
        echo !line! | findstr /r /c:"^[ \t]*\"MostRecent\"[ \t]*\"1\"[ \t]*$" >nul
        if not errorlevel 1 (
            set "targetID=!currentID!"
        )
    )
)

:: 输出结果并传递变量到外部环境
if defined targetID (
    echo 匹配到的SteamID：!targetID!
    endlocal & set "STEAM_ID=%targetID%"
) else (
    echo 未找到MostRecent为1的用户
    endlocal & set "STEAM_ID="
)

代码说明 #

• 启用延迟变量扩展：setlocal enabledelayedexpansion 允许在循环内实时修改变量值，避免批处理变量替换的延迟问题。
• 跟踪SteamID：通过正则匹配提取独立的带引号数字串，清理掉引号、空格和制表符后暂存为currentID。
• 括号层级判断：用braceLevel变量跟踪大括号嵌套层级，确保只处理当前SteamID对应的用户配置块，避免嵌套干扰。
• 匹配MostRecent：在用户块内检查是否存在"MostRecent" "1"，匹配成功则将暂存的SteamID赋值给targetID。
• 变量传递：通过endlocal & set "STEAM_ID=%targetID%"将结果变量传递到脚本外部环境，方便后续命令调用。

内容的提问来源于stack exchange，提问作者Nicholas Stockton