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Go regex

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Compilation time: 0.63 sec, absolute running time: 0.08 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 0,71 sec 
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username found at index 0
user_name found at index 1
user.name found at index 2
username123 found at index 3


    
                		
                
                    

                          
                                
                                
                        
                         



                        
                        
                        

                        

                        
                        

                          
                                
                                
                                  

                                    
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                                      .NET NoSQL database for rapid development