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Match ONLY relative URLs in CSS file, ignore data and absolute urls. https://github.com/FabioVergani/regex-Snippet/blob/master/css/MatchOnlyRelativeURLs-in-CSS.rgx match: url('/asdf/foo/bar.jpg'); url("foo/bar.jpg"); url(' /asdf/foo/bar.jpg '); url(" foo/bar.jpg "); url(" n "); url(' n '); url(/asdf/foo/bar.jpg); url(../bar.jpg); url( bar.jpg ); url( "data.jpg" ); url("data.jpg"); url('data.jpg'); url( 'data.jpg' ); url(data.jpg); url(' data '); url('data' ); url('data'); url( data ); url(data ); url(data); not: url('/asdf/fo'o/bar.jpg'); url('/asdf/f"oo/bar.jpg'); url("foo/b'ar.jpg"); url("fo"o/bar.jpg"); url(" "/asdf/foo/bar.jpg" "); url(""/asdf/foo/bar.jpg""); url(' '/asdf/foo/bar.jpg' '); url("'/asdf/foo/bar.jpg'"); url("/asdf/foo/bar.jpg'"); url("' "); url(" "); url(""); url(" '); url(' '); url( ); url(); url("/asdf/foo/bar.jpg'); url(/asdf/foo/bar.jpg'); url('/asdf/foo/bar.jpg); url("http://remote.com/asdf/foo/bar.jpg"); url( "http://remote.com/asdf/foo/bar.jpg" ); url('https://remote.com/asdf/foo/bar.jpg'); url(http://remote.com/asdf/foo/bar.jpg); url('http://remote.com/asdf/foo/bar.jpg"); url('http:www'); url('http:/'); url(data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7); url("data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"); url("data:image/gif;base64,"); url('data:image/gif;base64,"); url("'data:image/gif;base64,'"); url("data:;base64,"); url("data:;base64,'); url( data:"); url(data:"); url(data:); url("data.jpg'); url(data:;base64,);