sed & awk 的一个sed 问题的困惑。

wuxiaobo_2009

原始题目：

1. I want to see @f1(what will happen) if we put the
   
2. font change commands @f1(on a set of lines). If I
   
3. understand
   
4. things (correctly), the @f1(third) line causes problems.
   
5. (No?).
   
6. Is this really the case, or is it (maybe) just something
   
7. else?
   
8. Let's test having two on a line @f1(here) and @f1(there) as
   
9. well as one that begins on one line and ends @f1(somewhere
   
10. on another line). What if @f1(it is here) on the line?
    
11. Another @f1(one).

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要求把 @f1(内容) 变成\fb内容\fr
如果做练习，作者的这个东东是对的：

1. # Scribe font change script.
   
2. s/@f1(\([^)]*\))/\\fB\1\\fR/g
   
3. /@f1(.*/{
   
4. N
   
5. s/@f1(\(.*\n[^)]*\))/\\fB\1\\fR/g
   
6. P
   
7. D
   
8. }

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那么，如果在文本的well as one that begins on one line and ends @f1(somewhere之后在插入一行内容，你怎么做到替换成功? 如果这行之前还有@f1()是不是就无解，只能用交互式的进行？

hbmhalley

@()可能嵌套么?

wuxiaobo_2009

回复 3# hbmhalley


    嵌套的问题先不考虑。

wuxiaobo_2009

回复 1# wuxiaobo_2009


本书后边提到了这个问题郁闷，贴出来：
# Scribe font change script. New and Improved.
:begin
/@f1(\([^)]*\))/{
s//\\fB\1\\fR/g
b begin
}
/@f1(.*/{
N
s/@f1(\([^)]*\n[^)]*\))/\\fB\1\\fR/g
t again
b begin
}
:again
P
D



   

hbmhalley

1. 
   
2. :1
   
3. s/@f1(\([^)]*\))/\\fB\1\\fR/g
   
4. /@f1(/!b
   
5. s//\\fB/
   
6. :2 n;/)/!b2
   
7. s//\\fR/;b1
   

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要是没嵌套括号的话

rucypli

真他妈的高深