Ruby regex - gsub only captured group

Question

I\'m not quite sure I understand how non-capturing groups work. I am looking for a regex to produce this result: 5.214. I thought the regex below would work, bu

Answer 1

I know nothing about ruby.

But from what i see in the tutorial

gsub mean replace, the pattern should be /(?<=\d+),(?=\d+)/ just replace the comma with dot or, use capture /(\d+),(\d+)/ replace the string with "\1.\2"?