Referring to this How to convert part of a string that includes underscores to brackets in logstash with gsub

• what would be the reverse..

Input

Hello[1].Bye

Output

Hello_1_.Bye

CodePudding user response：

You could do that using mutate gsub ...

mutate { gsub => [ "someField", "[\[\]]", "_" ] }

The question is currently tagged as though it wants a solution using a ruby filter, but I cannot see any reason to do that.

CodePudding user response：

Input

a="Hello[1].Bye"

Code

p a.gsub(/([^\[]*)\[(.*)\]\.(.*)/,'\1_\2_.\3')

Output

"Hello_1_.Bye"