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中国DOS联盟论坛 » DOS批处理 & 脚本技术（批处理室） » New space deletion problem?? View 2,467　Replies 40
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Floor 16 Posted 2008-05-29 21:54　·　 中国 四川 成都 电信
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Originally posted by 26933062 at 2008-5-29 09:35 PM:

Hehe, the person above really has an efficiency issue.


I also considered the efficiency issue.

Just thought of another question: Doesn't the system spend time when processing!str:~0,1! for variable truncation?

Combined with everyone's discussion, variable truncation may be more efficient than findstr.

I think Brother WANKOILZ's should still be improved.
if "!str:~0,1!"=="" echo.

[ Last edited by zqz0012005 on 2008-5-29 at 09:56 PM ]
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amio +1 2008-05-29 22:21
hh.exe ntcmds.chm::/ntcmds.htm
Floor 17 Posted 2008-05-29 21:58　·　 中国 重庆 电信
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Hehe, I just want to target the simple form of text by the original poster, and the method is not perfect. Piping + findstr will reduce efficiency. Of course, if you want to be comprehensive, you can only use findstr.
Floor 18 Posted 2008-05-29 22:02　·　 中国 北京 联通互联网数据中心
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What I have isn't simple text; it's just modifying INF files. First, help me take a look at the problem on floor 15.
Floor 19 Posted 2008-05-29 22:07　·　 中国 湖南 娄底 电信
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Determine if there is a

@echo off&setlocal enabledelayedexpansion
for /f "tokens=*" %%a in (a.txt) do (
set "str=%%a"
set "str=!str:




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amio +2 2008-05-29 22:20
致精致简！
Floor 20 Posted 2008-05-29 22:16　·　 中国 重庆 电信
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Remove the spaces in front of the lines at the same time:
@echo off&setlocal enabledelayedexpansion

for /f "delims=" %%i in (1.txt) do (

echo %%i|findstr "^\$">nul&&echo.

for %%j in (%%i) do set str=!str! %%j

echo !str:~1!&set str=

)

pause>nul

The symbols need to be escaped with \ if used as ordinary symbols in findstr. Brothers 26 and zq ignored this, and I also discovered it after testing the previous code.

[ Last edited by WANKOILZ on 2008-5-29 at 10:27 PM ]
Floor 21 Posted 2008-05-29 22:23　·　 中国 湖南 娄底 电信
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The code on floor 19 can remove the spaces in front of the lines...
echo %%i|findstr "^\[.*\]$">nul This method is very inefficient.
致精致简！
Floor 22 Posted 2008-05-29 22:25　·　 中国 上海 电信
amio
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Originally posted by WANKOILZ at 2008-5-29 10:16 PM:
Remove the spaces in front of the lines at the same time:
@echo off&setlocal enabledelayedexpansion

for /f "delims=" %%i in (1.txt) do (

echo %%i|findstr "^\$">nul&&echo.

fo ...



This is a test...


cc dd will delete cc together
Floor 23 Posted 2008-05-29 22:29　·　 中国 重庆 电信
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Reply to the upstairs: It has been improved, but it's not as easy to use as 26933062's. tokens=* ensures that the spaces before the line are removed and the subsequent data remains unchanged, which should be the best method. As for the format like findstr "^\[.*\]$">nul, I'm using it for the first time, but the format like "^[.*]$" doesn't work.
Floor 24 Posted 2008-05-29 22:30　·　 中国 四川 成都 电信
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Forgot that "" are special characters in findstr

tokens=* removes leading spaces, Xiao Lou can always be innovative, really cost-effective!

[ Last edited by zqz0012005 on 2008-5-29 at 10:32 PM ]
hh.exe ntcmds.chm::/ntcmds.htm
Floor 25 Posted 2008-05-29 22:35　·　 中国 湖南 娄底 电信
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Methods to completely match 


@echo off

for /f "delims=:" %%a in ('findstr /n ".*\" a.txt') do set .%%a=a

for /f "tokens=1* delims=:" %%a in ('findstr /n .* a.txt') do (

   if defined .%%a echo.

   for /f "tokens=*" %%i in ("%%b") do echo.%%i

)

pause
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WANKOILZ +2 2008-05-29 22:41
致精致简！
Floor 26 Posted 2008-05-29 22:45　·　 中国 重庆 电信
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The method upstairs is really unique.
But I don't understand ".*\[..*\]":
1. Why isn't ".*" added later, such as: .*\[..*\].*
2. What does the two dots mean in "..*".
Please explain it for me upstairs.
Floor 27 Posted 2008-05-29 22:51　·　 中国 上海 电信
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There is also a problem...

Can we delete the lines starting with ; which are comments without deleting the ; in the middle of characters?

; asdasdasd
asd;asd
; qweqewqwe
---------------------------
asd;asd
Floor 28 Posted 2008-05-29 22:52　·　 中国 湖南 娄底 电信
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* represents 0 or n repetitions of the preceding character.
. represents at least one character.
If it is ".\*\[.\*\]", then it also matches the result of [] like this. That is: the content between [] is not matched.
致精致简！
Floor 29 Posted 2008-05-29 22:57　·　 中国 重庆 电信
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* means 0 or n repetitions of the preceding character
. means at least one character.
If it is ".*\", then it will also match results like . That is: with no content inside also matches.
It is very clear, thank you.
Also, please help again: Why not add .* at the end, in the form of ".*\.*", what is the difference between this and not adding it?

Reply to post 27: The code in post 25 meets your requirements

[ Last edited by WANKOILZ on 2008-5-29 at 10:59 PM ]
Floor 30 Posted 2008-05-29 23:01　·　 中国 四川 成都 电信
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If you add .* later, then lines like [reg]add which do not end with ] will also be matched, and such lines are not what the original poster wants.
hh.exe ntcmds.chm::/ntcmds.htm
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