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var patternTag = /(\?|\&)(tag=)(.*?)(\&|$)/gi;
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var url = "?tag=a";
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console.log(patternTag.test(url));
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console.log(!!url.match(patternTag));
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console.log(patternTag.test(url));
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console.log(!!url.match(patternTag));
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console.log(patternTag.test(url));
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console.log(!!url.match(patternTag));
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console.log(patternTag.test(url));
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console.log(!!url.match(patternTag));
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console.log(patternTag.test(url));
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console.log(!!url.match(patternTag));
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/*
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output:
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=======
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true
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false
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true
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false
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true
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*/