Regex to check with starts with http https or ftp

Question

I am framing a regex to check if a word starts with http    or https    or ftp     my code is as follows        public static void main String   args        try          String test    http   yahoo com           System out println test matches    http https ftp               finally             It prints false  I also checked stackoverflow post Regex to test if string begins with http    or https     The regex seems to be right but why is it not matching   I even tried   http https ftp      and   http https ftp

User · Answer

test matches   method checks all text use test find

User · Answer

You need a whole input match here   System out println test matches    http https ftp               Edit  Based on  davidchambers s comment   System out println test matches    https  ftp

User · Answer

Unless there is some compelling reason to use a regex  I would just use String startsWith   bool matches   test startsWith  http                     test startsWith  https                      test startsWith  ftp         I wouldn t be surprised if this is faster  too

User · Answer

I think the regex   string parsing solutions are great  but for this particular context  it seems like it would make sense just to use java s url parser   https   docs oracle com javase tutorial networking urls urlInfo html  Taken from that page   import java net    import java io     public class ParseURL       public static void main String   args  throws Exception            URL aURL   new URL  http   example com 80 docs books tutorial                                 index html name networking DOWNLOADING             System out println  protocol       aURL getProtocol             System out println  authority       aURL getAuthority             System out println  host       aURL getHost             System out println  port       aURL getPort             System out println  path       aURL getPath             System out println  query       aURL getQuery             System out println  filename       aURL getFile             System out println  ref       aURL getRef               yields the following   protocol   http authority   example com 80 host   example com port   80 path    docs books tutorial index html query   name networking filename    docs books tutorial index html name networking ref   DOWNLOADING

User · Answer

If you wanna do it in case-insensitive way  this is better   System out println test matches     i  https  ftp

[java] Regex to check with starts with http://, https:// or ftp://

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