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I am trying to use a regular expression to find a part of a string and select everything up to that string. So for example if my string is this/is/just.some/test.txt/some/other, I want to search for .txt and when I find it select everything before and up to .txt.
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[] denotes a character class. () denotes a capturing group. [a-z0-9] -- One character that is in the range of a-z OR 0-9.
Take this regular expression: /^[^abc]/ . This will match any single character at the beginning of a string, except a, b, or *c. If you add a * after it – /^[^abc]*/ – the regular expression will continue to add each subsequent character to the result, until it meets either an a , or b , or c .
Matches only at the end of the string. Most of the standard escapes supported by Python string literals are also accepted by the regular expression parser: \a \b \f \n \N \r \t \u \U \v \x \\ (Note that \b is used to represent word boundaries, and means “backspace” only inside character classes.)
E.g. (? i-sm) turns on case insensitivity, and turns off both single-line mode and multi-line mode.
After executing the below regex, your answer is in the first capture.
/^(.*?)\.txt/ If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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