Stata:正则表达式搜索和替换整型变量

Explanation of DATA: Contains a surveyor ID and answers to various survey questions. If one of the answers to the survey is 99 or 999 or 9999 (ad infinitum), then that is a numerical representation of "No." If one of the answers to the survey is 98 or 998 or 988, 9988, 998888, etc., that is a numerical representation of "Yes." Most of the data is in integer form. Explanation of DATA: Contains a surveyor ID and