What would /i at the end of gsub regex mean?

Question

I am starting on Ruby and referring to "Begining Ruby From Novice to professional" book. Something that I wasn't able to figure out is the /i at the end of this regex means..

text.gsub(/\b(You|Me|My|Your)\b/i) do |x|

Answer 1

The i modifier is used to perform case-insensitive matching. By using this modifier, letters in the pattern match both upper and lower case. Be sure to check out the Regexp documentation.

Answer 2

Thats case insensitive
it means no matter if the sentence or even the letter are upper or lower case

like

/foobar/i 

will match for any variation of upper and lower cases of foobar

you can define in some languages (?i:word)
if you want to match just F and B you can or any other letter or word

(?i:f)oo(?i:b)ar

will match for FooBar or foobar

Answer 3

i - means 'case insensetive'.

so /a/i matches "A"

You can be interested reading this and play with Rubular.