请教大家一个正则的问题

问你一个常规问题，问你一个常规问题的介绍:$ file content = preg _ replace("/\ {(\ \ \ $[a-zA-Z0-9 _ \[\]\ \-\ # 039；\,\%\*\/\.\(\)\ gt；\#039;\ quot\$\x7f-\xff]+)\}/