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function is_hexcolor(str)
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{
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regexp = /^#?([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/;
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if (regexp.test(str))
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{
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return true;
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}
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else
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{
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return false;
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}
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}
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console.log(is_hexcolor("#444"));
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console.log(is_hexcolor("#3333"));
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