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Regex: Filtering files by extension(@see http://www.mkyong.com/regular-expressions/how-to-validate-image-file-extension-with-regular-expression/)works for `filename.ext` and `.extension`
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| (([^\s]+)?(\.(?i)(jpg|png|gif|bmp|git|phar|txt|json))$) |
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Taken from here: http://www.mkyong.com/regular-expressions/how-to-validate-image-file-extension-with-regular-expression/