如何将包含括号的字符串的一部分转换为logstash中的下划线

Question

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

Answer 1

Input

a="Hello[1].Bye"

Code

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

Output

"Hello_1_.Bye"

Answer 2

You could do that using mutate+gsub ...

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