How do I put an escape character (NOT "escaped" character) in a Ruby regex?

I'm trying to parse a text file that has ANSI color sequences in it, e.g.

\e[0;37m

How can I build a regex to match this in开发者_开发知识库 Ruby?

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It turns out this works absolutely fine:

def strip_ansi_sequence (str)
  str.gsub(/\e\[[^m]*m/, '')
end