Example of regex used in import-js before moving to babylon

const_let_var_patttern.rb

    REGEX_CONST_LET_VAR = /
      \A
      (?<declaration_keyword>const|let|var)\s+ # <declaration_keyword>
      (?<assignment>.+?)   # <assignment> variable assignment
      \s*=\s*
      (?<import_function>\w+?)\( # <import_function> variable assignment
        (?<quote>'|")      # <quote> opening quote
        (?<path>[^\2\n]+)  # <path> module path
        \k<quote>          # closing quote
      \);?
      \s*
      \Z
    /xm