.ua <- "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2228.0 Safari/537.36"
.date_regex <- '([\\./\\-_]{0,1}(19|20)[[:digit:]]{2})[\\./\\-_]{0,1}(([0-3]{0,1}[[:digit:]][\\./\\-_])|(\\w{3,5}[\\./\\-_]))([0-3]{0,1}[[:digit:]][\\./\\-]{0,1})?'
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