Matching Repeated Words:

• Text: "The quick brown fox fox jumps over the lazy dog dog"
• Regex: (\b\w+\b)\s+\1
• Result: Matches fox and dog.

Matching Repeated Characters:

• Text: "Hellooo world"
• Regex: (\w)\1+
• Result: Matches oo.

Matching Repeated Numbers:

• Text: "123-123-4567"
• Regex: (\d{3})-(\1)-(\d{4})
• Result: Matches 123-123-4567.

Matching Repeated Letters:

• Text: "He laughed hahahaha"
• Regex: (ha)+
• Result: Matches hahaha.

Matching Repeated Patterns in HTML Tags:

• Text: "<div><p>Hello</p></div>"
• Regex: <(\w+)>(.*?)<\/\1>
• Result: Matches <div><p>Hello</p></div>. Captures div and p tags.

Matching Repeated Whitespace:

• Text: "The quick brown fox"
• Regex: (\s)\1+
• Result: Matches , , and .

Matching Repeated Hexadecimal Digits:

• Text: "1A1A2B2B3C3C"
• Regex: ([0-9A-Fa-f])\1
• Result: Matches 1A, 2B, and 3C.

Matching Repeated Letters Only at the Start of a Word:

• Text: "apple pear orange"
• Regex: (\b\w)\1\w*
• Result: Matches apple and orange.

Matching Repeated Words with Different Case:

• Text: "The the quick brown fox"
• Regex: (\b\w+\b).*?\1
• Result: Matches The the.

Matching Repeated Consonants:

• Text: "programming is fun"
• Regex: ([bcdfghjklmnpqrstvwxyz])\1+
• Result: Matches mming and n.