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Preview Ruby 4.1 is a preview. It can change before the final release. Switch to Ruby 4.0 →

instance method

NilClass#=~

(untyped obj) -> nil
nil =~ object → nil

Returns nil.

This method makes it useful to write:

Example
while gets =~ /re/
  # ...
end
See also #=== #^ #& #| also in 4.0 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0