1、测试数据
[root@centos79 test]# cat a.txt
a g e
u c j alike
i x k like
w f g liker
s g e g
[root@centos79 test]# grep like a.txt
u c j alike
i x k like
w f g liker
2、、B锚定单词的词首
[root@centos79 test]# cat a.txt a g e u c j alike i x k like w f g liker s g e g [root@centos79 test]# grep "like" a.txt u c j alike i x k like w f g liker [root@centos79 test]# grep "like" a.txt i x k like w f g liker [root@centos79 test]# grep "Blike" a.txt u c j alike
3、、B锚定词尾
[root@centos79 test]# cat a.txt a g e u c j alike i x k like w f g liker s g e g [root@centos79 test]# grep "like" a.txt u c j alike i x k like w f g liker [root@centos79 test]# grep "like" a.txt u c j alike i x k like [root@centos79 test]# grep "likeB" a.txt w f g liker
4、同时锚定词首和词尾
[root@centos79 test]# cat a.txt a g e u c j alike i x k like w f g liker s g e g [root@centos79 test]# grep "like" a.txt u c j alike i x k like w f g liker [root@centos79 test]# grep "like" a.txt i x k like [root@centos79 test]# grep -w "like" a.txt i x k like
5、
[root@centos79 test]# cat a.txt a g e u c j alike i x k like w f g liker s g e g [root@centos79 test]# grep "<like" a.txt i x k like w f g liker [root@centos79 test]# grep "like>" a.txt u c j alike i x k like [root@centos79 test]# grep "<like>" a.txt i x k like
参考：https://www.cnblogs.com/flyor/p/6411140.html