How to get max value of string inside braces

[jsamadhan]

Hi All,

I am new to splunk and need help in creating a table to get max value.
Below are my sample logs -

2017-05-25 14:21:06,757 INFO [http-/x.x.x.x.x:] [blablaServiceImpl] [myservices()][blablablablabla] [blablablablabla] [TOTAL_TIME_TAKEN][181]

Kindly help getting a table where max value of TOTAL_TIME_TAKEN will be displayed in (tabular foramat) per service

[woodcock]

Like this:

Your Base Search Here
|  rex "^([^\]]+\]){2}\s*\[(?<service>.*?)\(\)\]([^\]]+\]){2}\s*\[TOTAL_TIME_TAKEN\]\s*\[(?<TOTAL_TIME_TAKEN>\d+)"
| stats max(TOTAL_TIME_TAKEN) BY service

[adonio]

if you have lets say 181 extracted as a value of TOTAL_TIME_TAKEN

... | stats max(TOTAL_TIME_TAKEN) by service ?

[adonio]

or... full solution by @woodcock