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【一天学awk】正则匹配
2022-06-30 12:03:00 【程序员·小李】
正则匹配使用//包裹在内，表示一个正则表达式。使用时，直接使用awk指令即可。
单字符匹配.
行开始^，行结束$
备选、非备选[] [^]
逻辑或|
零或多次*、零或一次?、一或多次+
分组匹配 （）
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