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Lookbehind

• Positive Lookbehind (?<=)
• Negative Lookbehind - is !Positive Lookbehind (?<!)

Lookahead

• Positive Lookahead (?=)
• Negative Lookahead - is !Positive Lookahead (?!)

Positive Lookbehind

Negative Lookbehind

Positive Lookahead

Negative Lookahead

Greedy vs Lazy