Method and System for Providing a User Agent String Database

Abstract

Method, system, and programs for determining a keyword from user agent strings are disclosed. In one example, a plurality of user agent strings is received. The plurality of user agent strings is grouped into one or more clusters. The one or more clusters comprise a first cluster that includes two or more user agent strings. The two or more user agent strings in the first cluster are compared. Based on the comparing, a keyword is determined from the first cluster. The keyword represents a type of user agent information.

We claim: 
     
         1 . A method for analyzing a user agent string, comprising:
 receiving the user agent string;   extracting, based on a list of predefined keywords, candidate keywords from the user agent string;   obtaining a plurality of version extraction patterns for each of the candidate keywords, wherein each of the plurality of version extraction patterns indicates a name, a version pattern, and a corresponding matching condition; and   if the matching condition is met, 
 determining that the candidate keyword corresponds to the name, and 
 extracting a version according to the version pattern. 
   
     
     
         2 . The method of  claim 1 , further comprising:
 validating each of the candidate keywords based on one or more neighbor charsets of the candidate keyword in the user agent string.   
     
     
         3 . The method of  claim 1 , wherein the matching condition comprises whether the user agent string includes a predetermined sub-string. 
     
     
         4 . The method of  claim 1 , wherein the version pattern is a pattern of characters, associated with the version, expected in the user agent string. 
     
     
         5 . The method of  claim 1 , wherein the name corresponds to a name of an operation system and the version corresponds to a version of the operation system. 
     
     
         6 . The method of  claim 1 , wherein each of the plurality of version extraction patterns further indicates a position in the version pattern where the version is located. 
     
     
         7 . The method of  claim 1 , wherein each of the plurality of version extraction patterns further indicates a next step if the step of extracting a version fails. 
     
     
         8 . A non-transitory, computer-readable medium having information recorded thereon for analyzing a user agent string, wherein the information, when read by a machine, causes the machine to perform operations comprising:
 receiving the user agent string;   extracting, based on a list of predefined keywords, candidate keywords from the user agent string;   obtaining a plurality of version extraction patterns for each of the candidate keywords, wherein each of the plurality of version extraction patterns indicates a name, a version pattern, and a corresponding matching condition; and   if the matching condition is met, 
 determining that the candidate keyword corresponds to the name, and 
 extracting a version according to the version pattern. 
   
     
     
         9 . The medium of  claim 8 , wherein the operations further comprise:
 validating each of the candidate keywords based on one or more neighbor charsets of the candidate keyword in the user agent string.   
     
     
         10 . The medium of  claim 8 , wherein the matching condition comprises whether the user agent string includes a predetermined sub-string. 
     
     
         11 . The medium of  claim 8 , wherein the version pattern is a pattern of characters, associated with the version, expected in the user agent string. 
     
     
         12 . The medium of  claim 8 , wherein the name corresponds to a name of an operation system and the version corresponds to a version of the operation system. 
     
     
         13 . The medium of  claim 8 , wherein each of the plurality of version extraction patterns further indicates a position in the version pattern where the version is located. 
     
     
         14 . The medium of  claim 8 , wherein each of the plurality of version extraction patterns further indicates a next step if the step of extracting a version fails. 
     
     
         15 . A system for analyzing a user agent string, the system comprising:
 memory storing computer program instructions; and   one or more processors that, in response to executing the computer program instructions, effectuate operations comprising:   receiving the user agent string;   extracting, based on a list of predefined keywords, candidate keywords from the user agent string;   obtaining a plurality of version extraction patterns for each of the candidate keywords, wherein each of the plurality of version extraction patterns indicates a name, a version pattern, and a corresponding matching condition; and   if the matching condition is met, 
 determining that the candidate keyword corresponds to the name, and 
 extracting a version according to the version pattern. 
   
     
     
         16 . The system of  claim 15 , wherein the operations further comprise:
 validating each of the candidate keywords based on one or more neighbor charsets of the candidate keyword in the user agent string.   
     
     
         17 . The system of  claim 15 , wherein the matching condition comprises whether the user agent string includes a predetermined sub-string. 
     
     
         18 . The system of  claim 15 , wherein the version pattern is a pattern of characters, associated with the version, expected in the user agent string. 
     
     
         19 . The system of  claim 15 , wherein the name corresponds to a name of an operation system and the version corresponds to a version of the operation system. 
     
     
         20 . The system of  claim 15 , wherein each of the plurality of version extraction patterns further indicates a position in the version pattern where the version is located.