What does =~ mean in Ruby

I can't find an answer on Google about what =~ means in Ruby.

Here is an example I am trying to understand

 if regex =~ file

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and file in this case is from a loop:

Dir.entries(real_dir).each do |file|

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Mark_CoAsked:
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Paul JacksonSoftware EngineerCommented:
=~ is used to compare a string with a regular expression, will return true if a match is found or nil if there is no match.

http://www.ruby-doc.org/core-1.9.3/String.html#method-i-3D-7E
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