javascript - Angular js - optional dynamic url params -

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I have set up a simple paging URL like this: 

 . When ('/ Users:: offset /: filter /: keyword', {templateUrl: 'views / users / index.html', administrator: 'user', reloadon search: folley}). Otherwise ({redirectTo: '/'});   
 Now if I browse  site.co/users/5/1/heykeyword   
 but if I  site I was redirected to .CO / User / 5/1  me  /    
 What's wrong?  
 Should not the roads be moving?!!   
 
 
 The problem is whether you have written, a required argument is included,  
 You can get it optional by adding 'keyword' (by adding a question mark):  
 . When ('/ user /: offset /: filter /: keyword?', {TemplateUrl: 'views / users / index.html', administrator: 'user', reloadon search: folley}). Otherwise ({redirectTo: '/'}); Offset & amp;   
 A filter is required, but the keyword parameter is now optional.  
 For more information: $ pathProvider  
 From the angularjs document:  
 
 The path can be optional in the named group with a question mark: eg : Name.

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