regex statement

I am trying to extract the response time from this statement (Just the number, not the words response time or the ms behind it) Here is a regex statement I wrote ((response time: )(\w+)) this is splitting the number into the 3rd group but I am unsure as to how to remove the other two groups from the results as I need them to help with the matching aspect Here is the statement I am trying to extract from: <117>Aug 26 15:22:16 777-120 SLAVE[p-core_987734]: 2016-08-26 15:22:16,7t2 INFO [q44760481-48788] 6699-4871-a646-1b15556d queriesAndResponseTimeLogger - Client request: /search?keyword=tools+accessories&sendRefinements=false&count=3, response time: **70** ms, stage1Count=0, stage2Count=13, effectiveStage=STAGE2 The bolded number is the one I want