China DOS Union

I'm no good at anything else, but sometimes I get sudden ideas.
Please test the following code, so as to inspire everyone to dig into the potential of certain commands.

@echo off Title Calculating String Length set /p string=Please enter a string: REM ""%string%" is for compatibility with input containing spaces echo "%string%">%temp%\temp.txt echo eof>>%temp%\temp.txt for /f "delims=:" %%i in ('findstr /o /c:"eof" %temp%\temp.txt') do set /a len=%%i-4 echo String length:%len% pause

What you get is not the string length, but... the byte count...

If it's Chinese characters...

PS: If you're using the file size method, it seems you can use for's %~zI

Can't really count as a new method, right? People brought up the offset method a long time ago.

@echo off set str=abc for /f "skip=1 delims=:" %%a in ('^(echo "%str%"^&echo.^)^|findstr /o ".*"') do set /a length=%%a-5 echo %length%

If you're generating a temporary file, then just use for's %~zI directly, otherwise use the method from post #3

If you also calculate Chinese characters by offset, you'll get the wrong result, hehe.

@echo off set str=我是abc set length=0 :begin set char=%str:~0,1% set /a length+=1 set str=%str:~1% if "%str%" equ "" ( echo %length% goto :eof ) else ( goto :begin )

But I did think of this independently. I didn't know someone had already brought it up. What a pity, I originally thought it was the first of its kind.

If I'd known earlier, I wouldn't have taken it out and made a fool of myself.

By the way, can anyone give some detailed examples of findstr? List each parameter, especially things in regular expressions like $ and \X and the like. I really haven't seen any concrete examples.

TO 6

This is the FINDSTR usage info I collected. It's very helpful, let's learn it together!~

Basic usage of FINDSTR regular expressions Code: 1.findstr . 2.txt or Findstr "." 2.txt Search for any character in file 2.txt, excluding null characters or blank lines ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 2.findstr .* 2.txt or findstr ".*" 2.txt Search for any character in file 2.txt, including blank lines and null characters ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 3.findstr "" 2.txt Search in file 2.txt for strings or lines containing digits 0-9 ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 4.findstr "" 2.txt Search in file 2.txt for strings or lines containing any letters ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 5.findstr "" 2.txt Search in file 2.txt for strings or lines containing the letters a b c e z y ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 6.findstr "" 2.txt Search in file 2.txt for strings containing lowercase characters a-f and l-z, but not the letters g h I j k. ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 7.findstr "MY" 2.txt In file 2.txt it can match MahY, MbiY, MahY, etc..... ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 8. The use of the symbols ^ and $ ^ indicates the beginning of a line, "^step" only matches the first word in "step hello world" $ indicates the end of a line, "step$" only matches the last word in "hello world step" ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 9.finstr "" 2.txt If it is a purely numeric string or line, then it will be filtered out, for example a string like 2323423423. But if it is in a form like 345hh888 then it won't work. ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 10.findstr "" 2.txt Same as above, if it is a purely alphabetic string or line, then it will be filtered out, for example characters like sdlfjlkjlksjdklfjlskdf. But if it is in a form like sdfksjdkf99999, mixed with digits, then it won't work. ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 11.The role of the * sign As already mentioned above, ".*" means the search condition is any character. The role of * in regular expressions is not any character, but indicates the repetition count of the character or expression on the left side. * indicates the repetition count is zero or more times. ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 12.findstr "^*$" 2.txt This matches purely numeric text that is found, for example 234234234234. If it is 2133234kkjl234 then it gets filtered out. Findstr "^*$" 2.txt This matches purely alphabetic text that is found, for example sdfsdfsdfsdf. If it is 213sldjfkljsdlk then it gets filtered out. If there is no * sign in the search condition, that means the search condition on the left side is not repeated, that is , then it can only match the first character of the string, and only this one character, because there is the restriction of beginning and end of line. With "^$", if the first character is a digit then it matches, if not then it is filtered out. If the string is 9 then it matches, but if it is 98 or 9j and the like then it won't work. ＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝ 13. The role of the "\<…\>" expression This means searching exactly for a string. \<sss indicates the starting position of the word, and sss\> indicates the ending position of the word. echo hello world computer|findstr "\<computer\>" works in this form echo hello worldcomputer|findstr "\<computer\>" in this form won't work. What it wants to find is the string "computer", so that won't do. echo hello worldcomputer|findstr ".*computer\>" this way it can match

For reference on the function of symbols in CMD/DOS
http://www.cn-dos.net/forum/viewthread.php?tid=30985&fpage=4

If you still don't understand, you can post the findstr command you saw, and naturally someone will explain it, hehe.

OP, I just looked at your program for calculating character length, and there's a question: why do you subtract 4 at the end, and not 3? eof is only three characters. Thanks for clearing that up for me.

Subtract 4, namely: two double quotation marks, one newline character \n, and one text end marker eof

Thanks, brother above