Your inputdata in indat

# cat indat
192.168.1.1 index.html index 5 seconds
192.168.1.1 links.html links, index.html index 10 seconds
192.168.1.1 article1.html  art1, article2.html art2, adpage 200 second
+s
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Try this

# perl -wne '/[\d\.]+\s(.+)\sseconds/i && print "Test Data: $1\n"' ind
+at
Test Data: index.html index 5
Test Data: links.html links, index.html index 10
Test Data: article1.html  art1, article2.html art2, adpage 200
[download]

The decisive regex-part is (.+). The braces catch the desired String in the $1-variable. The regex-part [\d\.]+ matches on decimals or points as they appears in the ip-addresses. Consider man perlre for precise regex-infos.