正则表达式的贪婪匹配

?正则表达式的贪婪匹配2009-07-05 09:26:03标签：sed?正则?shell?贪婪?awk原创作品，允许转载，转载时请务必以超链接形式标明文章?原始出处?、作者信息和本声明。否则将追究法律责任。http://tanzj.blog.51cto.com/802764/174233str="uid=100(guest) gid=100(others) groups=10(users),11(floppy)"取guest??others??users??floppy正则表达式是有贪婪性的，它总是与最长的可能长度匹配，而且越是排在前面的通配符优先级越高。?#!/bin/bashstra="uid=100(guest) gid=100(others) groups=10(users),11(floppy)"strb="uid=100(guest)gid=100(others)groups=10(users),11(floppy)"?#floppyecho $stra |sed 's/.*(\(.*\)).*/\1/'echo $stra |awk '{a=substr($3,length($3)-6,6); b=substr($3,1,6); c=length($3);print a,b,c}'#guestecho $stra |sed 's/[^(]*(\([^)]*\)).*/\1/'echo $stra |awk '{a=gensub(/.*\((.*)\)/,"\\1","g",$1);print a}'#othersecho $stra |sed 's/users\|others/***&***/g'echo $stra |sed 's/[^(]*([^)]*)[^(]*(\([^)]*\)).*/\1/'echo $stra |sed 's/[^ ]*[ ][^(]*(\([^)]*\)).*/\1/'#usersecho $stra |sed 's/.*[ ][^(]*(\([^)]*\)).*/\1/'echo $stra |awk '{a=gensub(/[^(]*\(([^)]*).*/,"\\1","g",$3);print a}'?时间一久自己都看的晕忽忽的。。。记下来用的时候翻翻

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