轉(zhuǎn)義問(wèn)題

zyj19871215

sed -r 's/[a-Z]+([^a-Z]+[a-Z]+)$/\1/' passwd_bak  刪除每行的第二個(gè)單詞
我 不想用-r，自己用轉(zhuǎn)義
sed  's/\[a-Z]+\(\[^a-Z]+\[a-Z]+\)$/\1/' passwd_bak 為啥不可以呢？

jiaogeshahaone

\[^a-Z]+\[a-Z]+
轉(zhuǎn)頭不轉(zhuǎn)尾？

li0924

1. cut -d" " -nf 1,3-

復(fù)制代碼

jason680

回復(fù) 1# zyj19871215

You need to know what different between Extended and Basic regular expression
Note: Basic regular expression didn't support plus(+) sign for "One or more duplicates" function

http://www.grymoire.com/Unix/Regular.html#uh-12
   

zyj19871215

中括號(hào)就是轉(zhuǎn)義頭不轉(zhuǎn)尾，小括號(hào)都需要轉(zhuǎn)義回復(fù) 2# jiaogeshahaone


   

dn833

加號(hào)也得轉(zhuǎn)

zyj19871215

我這里的加號(hào)是要匹配，不是加號(hào)，所以不用轉(zhuǎn)義吧回復(fù) 6# dn833


   

dn833

隨便你啦～～～just have a踹

zyj19871215

那你能給我一個(gè)正確的表達(dá)式嘛？回復(fù) 8# dn833


   

dn833

你能給兩行文本，哥就敢說(shuō)給你個(gè)表達(dá)式