China DOS Union

findstr /r /m ".txt"

When I want to search all text files in the current directory for files that contain Chinese characters (double-byte characters), how should be expressed??

[ Last edited by namejm on 2006-12-25 at 12:57 PM ]

　　 is that what you want to search for? Or do you want to search for all Chinese characters?

All Chinese characters

Could an expert please give me some advice, mail:everest79@163.com

　　findstr doesn't have a regex specifically for matching Chinese characters yet, so it's rather troublesome.

Could namejm give an example of a class expression? Is it used by the name of a character set?

　　I once posted this article before, the basic usage of FINDSTR regular expressions as organized by brother 9527. I can't find that post right now, so I'm posting it again:

             Basic usage of FINDSTR regular expressions



1.findstr . 2.txt 或 Findstr "." 2.txt  

Search any character in file 2.txt, excluding null characters or blank lines

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2.findstr .* 2.txt 或 findstr ".*" 2.txt

Search any character in file 2.txt, including blank lines and null characters

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3.findstr "" 2.txt

Search strings or lines in file 2.txt that include digits 0-9

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4.findstr "" 2.txt

Search strings or lines in file 2.txt that include any letters

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5.findstr "" 2.txt

Search strings or lines in file 2.txt that include the letters a b c e z y

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6.findstr "" 2.txt

Search strings of lowercase characters a-f l-z in file 2.txt, but not the letters g h I j k.

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7.findstr "MY" 2.txt

In file 2.txt it can match MahY, MbiY, MahY, etc…..

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8. Application of the ^ and $ symbols

^ indicates the start of a line; "^step" matches only the first word in "step hello world"

$ indicates the end of a line; "step$" matches only the last word in "hello world step"

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9.finstr "" 2.txt

If it is a pure numeric string or line, it gets filtered out, for example a string like 2323423423. But a form like 345hh888 won't do.

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10.findstr "" 2.txt

Same as above. If it is a pure alphabetic string or line, it gets filtered out, for example characters like sdlfjlkjlksjdklfjlskdf. But a form like sdfksjdkf99999, mixed with digits, won't do

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11.The role of the * sign

This was already mentioned above: ".*" means the search condition is any character. The role of * in a regular expression is not "any character", but the number of repetitions of the character or expression on the left. * means the number of repetitions is zero or more.

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12.findstr "^*$" 2.txt

This matches pure numbers that are found, for example 234234234234. If it is 2133234kkjl234 then it gets filtered out.

   Findstr "^*$" 2.txt

This matches pure letters that are found, for example sdfsdfsdfsdf. If it is 213sldjfkljsdlk then it gets filtered out

If there is no * in the search condition, that is, the search condition on the left is not repeated, in other words  , then it can only match the first character of the string and only that one character, because of the restriction of start-of-line 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 or the like then it won't work.

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13. The role of the "\<…\>" expression

This means an exact search for a string. \<sss means the starting position of a word, and sss\> means the ending position of a word

echo hello world computer|findstr "\<computer\>" in this form

echo hello worldcomputer|findstr "\<computer\>" in this form won't do. What it is looking for is the string "computer", so it won't work.

echo hello worldcomputer|findstr ".*computer\>" this way it can match

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