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Double tilde

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Double tilde (~~ or ≈) may refer to:

Approximation [≈]
Double negation [ ~(~ ]

Smart match operator in Perl, ~~
Double binary NOT operator (as used in languages like JavaScript and PHP as a quick way to cast variable as integer, where it is called 'two tildes' to indicate a form of double negation)
In PostgreSQL the operator ~~ is equivalent to LIKE

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