What does the !~ method do with String in Ruby

Question

From @sawa\'s answer at: https://stackoverflow.com/a/21892359/226255

What does !~ do?

Example:

re = /[^\\d.,]/
\"0.0687987167581341,         


        

Answer 1

It means the regex does not match. It's the inverse of =~

Also mentioned here: Does Ruby regular expression have a not match operator like "!~" in Perl?

Apparently it's not documented for some reason.

Answer 2

The method !~ is the inverse of =~, that is !(=~). From the Ruby Object#!~ documentation:

[obj !~ other ] returns true if two objects do not match (using the =~ method), otherwise false.

So, since String#=~ performs a string/regex match returning the index of the first match if matched and nil otherwise, String#!~ return false if matched and true otherwise.