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alert(/ruby/.test("ruby"));//true
alert(/[abc]/.test("a"));//true
alert(/[abc]/.test("b"));//true
alert(/[abc]/.test("c"));//true
alert("a bat ,a Cat,a fAt bat ,a faT cat".match(/[bcf]at/gi));//bat,Cat,fAt,bat,faT,cat
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alert(/[^abc]/.test("b"));//false
alert(/[^abc]/.test("6"));//true
alert(/[^abc]/.test("gg"));//true
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alert(/[a-f]/.test("b"));//true
alert(/[a-f]/.test("k"));//false
alert(/[a-z]/.test("h"));//true
alert(/[A-Z]/.test("gg"));//false
alert(/[^H-Y]/.test("G"));//true
alert(/[0-9]/.test("8"));
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