泰州seo公司,seo搜索优化公司排名,便捷网站建设,开平做网站今天被这个方括号懵晕了#xff0c;特此记录
例如#xff1a; 去除输入字符串“1[2.3]4[ab,c]”中的所有方括号和逗号#xff1a; $ echo 1[2.3]4[ab,c]|sed -e s/[,\]\[]//g 1[2.3]4[ab,c]
It doesnt work!
原因#xff1a;Regular Expressi…今天被这个方括号懵晕了特此记录
例如 去除输入字符串“1[2.3]4[ab,c]”中的所有方括号和逗号 $ echo 1[2.3]4[ab,c]|sed -e s/[,\]\[]//g 1[2.3]4[ab,c]
It doesnt work!
原因Regular Expressions
The right-square-bracket ( ] ) shall lose its special meaning and represent itself in a bracket expression if it occurs first in the list (after an initial circumflex ( ^ ), if any).
解决方案关键是要把 ] 右方括号不加escape放在首位.
$ echo 1[2.3]4[ab,c]|sed -e s/[][,]//g 12.34abc
$ echo 1[2.3]4[ab,c]|sed -e s/[]\[,]//g 12.34abc
$ echo 1[2.3]4[ab,c]|sed -e s/[],[]//g 12.34abc
The order of some characters is important:
- should be at the end like this -][] should be like that [][other characters] should be escaped like that \not begin with ^ like in [^not begin with [. [ [: and end with .] ] :]not end with $]
References:
regex - How to escape square closing bracket in sed - Stack Overflow
Regular Expressions
