Regex for leading and trailing whitespace

Note

With the m flag, ^ and $ work per line. Replace with nothing to trim every line.

Matches in the example

• " "
• " "
• "\t"
• " "

Token by token

1. ^ the start of the string (or line, with the m flag)
2. [ \t]+ one of: a space or a tab, one or more times, as many as possible
3. | or
4. [ \t]+ one of: a space or a tab, one or more times, as many as possible
5. $ the end of the string (or line, with the m flag)

Other patterns

• Email address
• URL
• IPv4 address
• UUID
• Hex color
• Date (YYYY-MM-DD)
• Time (24-hour)
• US phone number
• Phone number (E.164)
• US ZIP code
• Credit card number
• URL slug
• Username
• Strong password
• HTML tag
• Semantic version
• MAC address
• JSON Web Token
• Hashtag
• @mention
• Number
• Leading and trailing whitespace
• Repeated word
• Blank lines
• Markdown link
• Quoted string
• Domain name
• File extension
• Base64
• Trailing comma