How to remove whitespace characters in the middle and sides of a string-JavaScript regular expression basics and practice-php.cn

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JavaScript regular expression basics and practice

Chapter1 Basic knowledge of regular expressions
1-1 First experience with regular expressions
1-2 Two ways to create regular objects
1-3 What are regular modifiers?
1-4 Types and uses of atomic characters
1-5 mysterious metacharacters
1-6 Character object methods that support regular parameters
Chapter2 Regular expression practical case
2-1 Use capture groups to get the most repeated characters and their number (1)
2-2 Use capture groups to get the most repeated characters and their number (2)
2-3 How to remove whitespace characters in the middle and sides of a string
2-4 How to verify whether the email is legitimate?
2-5 How to filter mobile phone numbers in user messages?

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