January 2021
Intermediate to advanced
581 pages
15h 7m
Chinese
Content preview from bash shell脚本编程经典实例 （第2版）
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122
｜
第
6
章
子表达式，接下来是一个字面连字符和空白字符。
第二个子表达式（标记为粗体）会尝试匹配曲目编号。
([[:alpha:][:blank:]]*)-
([[:digit:]]*)
- (.*)$
这个子表达式以另一个左括号起始。曲目编号为整数，由多个数位组成（字符类
[:digit:]
），
我们将其写入另一对方括号并在后面加上一个星号，也就是
[[:digit:]]*
，以此表示方括号
中的内容（数位）重复出现
0
次或多次。接着是字面空白字符、连字符、空白字符。
最后一个子表达式匹配包括曲目名、文件扩展名在内的所有剩余内容。
([[:alpha:][:blank:]]*)- ([[:digit:]]*) -
(.*)$
括号中的
.*
是一种常见的正则表达式，并不陌生，它表示任意字符（
.
）出现任意多次
（
*
）。我们用美元符号结束整个表达式，以匹配字符串结尾。匹配过程区分大小写，但是
可以用
shopt -s nocasematch
（
bash 3.1
版本以上可用）修改这种行为。该选项会影响到
case
和
[[
命令。
6.8.4
参考
•
有关正则表达式库的细节，详见
man regex
（
Linux
、
Solaris
、
HP-UX
）或者
man re_format
（
BSD
、
Mac
）
• Jeffrey E. F. Friedl
所著的
Mastering Regular Expressions, 3rd Edition
（
O
’
Reilly
出版）
• 7.7
节
• 7.8
节
• 19.15
节
6.9
用重定向改变脚本行为
6.9.1 ...
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