Regex for repeated word

Note

The backreference \1 matches whatever the group captured, so any word typed twice is caught.

Matches in the example

• "is is"
• "the the"

Token by token

1. \b a word boundary
2. ( a capturing group
3. \w+ a word character (letter, digit or _), one or more times, as many as possible
4. ) end of group
5. \s+ a whitespace character, one or more times, as many as possible
6. \1 the same text group 1 matched
7. \b a word boundary

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