/abc/
/abc/imx
%r/ab cd /
%r_ab cd ef_

/\A[a-z]+(foo|bar?)*(?:baz)\w+(?=<\/b>)/.match('test')

/ab
  c d  
   e
 fgh /i

/ab#{c}d/

#0
/ab#{
  #1
  #2
  c #3
  #4
} d #{
  #5
}e/m #6
#7

# Currently no special formatting for extended syntax.
/a
b # comment

spaces|ignored
  #{2}
/x

## match last lines

if /abc/
  true
end

if /ab#{1}c/i
  true
end

if /ab
  cd # e
  /x
  true
end

## match writes

/(?<foo>bar)/ =~ baz
p foo

# 0
/(?<foo>bar)/ =~
  # 1
  # 2
  baz # 3
# 4