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<p style="margin: 10px 0 0 0">Actually I am getting skeptical about the performance gain claim. I wrote a little performance test using <a href="http://openjdk.java.net/projects/code-tools/jmh/" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">JMH</a> - <a href="https://github.com/hferentschik/jmh-perf-tests/tree/master/url-constraint-perf" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">url-constraint-perf</a> and the validation via the URL constructor comes out ahead. Using the single shot time mode, I get for example:</p>
<div class="preformatted panel" style="border-width: 1px;; border: 1px solid #ccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #ccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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<pre style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal; white-space: pre; word-break: normal; word-wrap: break-word; word-break: break-word; white-space: pre-wrap"># Run complete. Total time: 00:32:25
Benchmark (url) Mode Samples Score Error Units
o.h.v.URLConstraintBenchmark.measureValidationUsingRegExp http://foo.com/blah_blah sample 1703711 7.290 ? 0.028 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingRegExp http://142.42.1.1:8080/ sample 1318943 5.262 ? 0.032 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingRegExp http://??????.?????? sample 1340940 2.626 ? 0.026 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingRegExp http//foo/ sample 1425989 0.362 ? 0.004 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingRegExp ///a sample 1421783 0.204 ? 0.005 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingRegExp :// should fail sample 1420884 0.206 ? 0.007 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingURLConstructor http://foo.com/blah_blah sample 1552078 0.341 ? 0.007 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingURLConstructor http://142.42.1.1:8080/ sample 1245500 0.416 ? 0.012 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingURLConstructor http://??????.?????? sample 1805705 0.289 ? 0.003 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingURLConstructor http//foo/ sample 1675968 2.135 ? 0.009 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingURLConstructor ///a sample 1613901 2.104 ? 0.009 us/op
o.h.v.URLConstraintBenchmark.measureValidationUsingURLConstructor :// should fail sample 1734023 2.057 ? 0.006 us/op
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<p style="margin: 10px 0 0 0">Note, that in this particular test regexp seems to e better for invalid urls, whereas URL constructor for valid ones. My guess is that building the throwing the exception for invalid URLs might take some time here. I also checked the URL implementation, the lookup/loading of the handler might take some time, but afaiks it is cached (which one would expect anyways). Even if I change the harness parameters, URL constructor validation seems to come out ahead. </p>
<p style="margin: 10px 0 0 0">Btw, I noticed some differences in what the regexp vs the URL constructor "consider" valid. I also looked at <a href="https://mathiasbynens.be/demo/url-regex" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://mathiasbynens.be/demo/url-regex</a> and noticed that many of the URLs listed there as invalid would be accepted by the suggested regexp as well as the URL constructor. This is just showing what a mine field this whole url validation is.</p>
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