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POWhich is the best way to match short string? regular expression or if else statement?
 

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  1. POWhich is the best way to match short string? regular expression or if else statement?
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    <p>In testOne() I use regex expression use judge if a string contains some specific strings</p> <p>In testTwo() I use if else statement to to the same thing</p> <p>I wonder why testTwo() is always faster than testOne() in my test cases</p> <p>Is regex expression not suitable for the problem? or my regex expression is not well written?</p> <p>My test code is as follow, thanks very much!</p> <pre><code>public class TestReg { static final Pattern PATT = Pattern .compile("(tudou|video.sina|v.youku|v.ku6|tv.sohu|v.163|tv.letv|v.ifeng|v.qq|iqiyi|(5)?6)\\.(com|cn)"); @Test public void testOne() { int count = 0; for (int i = 0; i &lt; 10000; i++) { for (String vurl : TESTCASES) { if (PATT.matcher(vurl).find()) count++; } } System.out.println("testOne:" + count); } @Test public void testTwo() { int count = 0; for (int i = 0; i &lt; 10000; i++) { for (String vurl : TESTCASES) { if (vurl.indexOf("tudou.com") != -1 || vurl.indexOf("video.sina.com") != -1 || vurl.indexOf("v.youku.com") != -1 || vurl.indexOf("v.ku6.com") != -1 || vurl.indexOf("56.com") != -1 || vurl.indexOf("tv.sohu.com") != -1 || vurl.indexOf("v.163.com") != -1 || vurl.indexOf("tv.letv.com") != -1 || vurl.indexOf("v.ifeng.com") != -1 || vurl.indexOf("v.qq.com") != -1 || vurl.indexOf("iqiyi.com") != -1 || vurl.indexOf("6.cn") != -1) { count++; } } } System.out.println("testOne:" + count); } static final String[] TESTCASES = { "http://blog.csdn.net/v_july_v/article/details/7624837", "http://jobs.douban.com/intern/apply/?type=dev&amp;position=intern_sf", "https://class.coursera.org/ml/lecture/index", "http://blog.csdn.net/v_july_v/article/details/7624837", "http://jobs.douban.com/intern/apply/?type=dev&amp;position=intern_sf", "https://class.coursera.org/ml/lecture/index", "http://blog.csdn.net/v_july_v/article/details/7624837", "http://jobs.douban.com/intern/apply/?type=dev&amp;position=intern_sf", "https://class.coursera.org/ml/lecture/index", "http://blog.csdn.net/v_july_v/article/details/7624837", "http://jobs.douban.com/intern/apply/?type=dev&amp;position=intern_sf", "https://class.coursera.org/ml/lecture/index", "http://www.56.com/u38/v_NjYyNTUyMjc.html", "http://video.sina.com.cn/v/b/69614895-2128825751.html", "http://www.tudou.com/programs/view/xcPewAoJ26M", "http://v.youku.com/v_show/id_XMzQ0OTI0MTgw.html", "http://www.56.com/u87/v_NjMzMjEzNTY.html", "http://tv.sohu/u87/v_NjMzMjEzNTY.html", "http://tv.letv/u38/v_NjYyNTUyMjc.html", "http://v.ifeng/v/b/69614895-2128825751.html", "http://v.qq/programs/view/xcPewAoJ26M", "http://v.163/v_show/id_XMzQ0OTI0MTgw.html", "http://iqiyi/u87/v_NjMzMjEzNTY.html", "http://v.6.cn/u87/v_NjMzMjEzNTY.html" }; } </code></pre>
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    1. PTQuestion
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    1. USwfwei
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      1. VTDownMod
    1. COAre you *actually* only trying to match host names? If so, that's what you should use - otherwise you would match a URL which contained `todou.com` in the path, for example.
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      1. USJon Skeet
    2. COWhich programming language is this?
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