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How to express spaces in regular expressions
Regular expression spaces can be represented by "\s", which is a special metacharacter used to match any whitespace characters, including spaces, tabs, newlines, etc. If you want to know more about how spaces are represented in regular expressions, you can visit the following article.
How to express spaces in regular expressionsRegular expression spaces can be represented by "\s", which is a special metacharacter used to match any whitespace characters, including spaces, tabs, newlines, etc. You can also use "\s+" in regular expressions to represent multiple consecutive space characters, and "\S" to represent other characters except space characters. Proficient in these representation methods, you can better apply regular expressions to character String matching and processing.
What are the rules for regular expressionsThe rules of regular expressions include character categories, special characters, selectors, escape characters, capture groups, back references, zero-width assertions, quantifiers, boundaries, comments, etc. Detailed introduction: 1. Character categories, specific character categories can be used in regular expressions to represent character sets; 2. Special characters, there are many special characters in regular expressions, used to express specific meanings; 3. Selectors, use "|" represents the selection relationship, that is, matching the subexpression on the left side of "|" or the subexpression on the right side; 4. Escape characters, use backslash "\" to escape special characters, etc.
What functions do regular expressions have?Regular expressions include match(), search(), findall(), sub(), split(), compile() and other functions. Detailed description: 1. match(), used to check whether a string matches a specified pattern; 2. search(), used to search for a specified pattern in a string; 3. findall(), used to search in a string Search for all matching substrings in the string and return them in list form; 4. sub(), used to search for a specified pattern in a string, etc.
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