regexp.rb:
#    5| [RegExpConstant, RegExpNormalChar] abc

#    8| [RegExpConstant, RegExpNormalChar] a

#    8| [RegExpStar] a*
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a

#    8| [RegExpSequence] a*b+c?d
#-----| 0 -> [RegExpStar] a*
#-----| 1 -> [RegExpPlus] b+
#-----| 2 -> [RegExpOpt] c?
#-----| 3 -> [RegExpConstant, RegExpNormalChar] d

#    8| [RegExpConstant, RegExpNormalChar] b

#    8| [RegExpPlus] b+
#-----| 0 -> [RegExpConstant, RegExpNormalChar] b

#    8| [RegExpConstant, RegExpNormalChar] c

#    8| [RegExpOpt] c?
#-----| 0 -> [RegExpConstant, RegExpNormalChar] c

#    8| [RegExpConstant, RegExpNormalChar] d

#    9| [RegExpConstant, RegExpNormalChar] a

#    9| [RegExpRange] a{4,8}
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a

#   10| [RegExpConstant, RegExpNormalChar] a

#   10| [RegExpRange] a{,8}
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a

#   11| [RegExpConstant, RegExpNormalChar] a

#   11| [InfiniteRepetitionQuantifier, RegExpRange] a{3,}
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a

#   12| [RegExpConstant, RegExpNormalChar] a

#   12| [RegExpRange] a{7}
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a

#   15| [RegExpConstant, RegExpNormalChar] foo

#   15| [RegExpAlt] foo|bar
#-----| 0 -> [RegExpConstant, RegExpNormalChar] foo
#-----| 1 -> [RegExpConstant, RegExpNormalChar] bar

#   15| [RegExpConstant, RegExpNormalChar] bar

#   18| [RegExpCharacterClass] [abc]
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a
#-----| 1 -> [RegExpConstant, RegExpNormalChar] b
#-----| 2 -> [RegExpConstant, RegExpNormalChar] c

#   18| [RegExpConstant, RegExpNormalChar] a

#   18| [RegExpConstant, RegExpNormalChar] b

#   18| [RegExpConstant, RegExpNormalChar] c

#   19| [RegExpCharacterClass] [a-fA-F0-9_]
#-----| 0 -> [RegExpCharacterRange] a-f
#-----| 1 -> [RegExpCharacterRange] A-F
#-----| 2 -> [RegExpCharacterRange] 0-9
#-----| 3 -> [RegExpConstant, RegExpNormalChar] _

#   19| [RegExpConstant, RegExpNormalChar] a

#   19| [RegExpCharacterRange] a-f
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a
#-----| 1 -> [RegExpConstant, RegExpNormalChar] f

#   19| [RegExpConstant, RegExpNormalChar] f

#   19| [RegExpConstant, RegExpNormalChar] A

#   19| [RegExpCharacterRange] A-F
#-----| 0 -> [RegExpConstant, RegExpNormalChar] A
#-----| 1 -> [RegExpConstant, RegExpNormalChar] F

#   19| [RegExpConstant, RegExpNormalChar] F

#   19| [RegExpConstant, RegExpNormalChar] 0

#   19| [RegExpCharacterRange] 0-9
#-----| 0 -> [RegExpConstant, RegExpNormalChar] 0
#-----| 1 -> [RegExpConstant, RegExpNormalChar] 9

#   19| [RegExpConstant, RegExpNormalChar] 9

#   19| [RegExpConstant, RegExpNormalChar] _

#   20| [RegExpCaret] \A

#   20| [RegExpSequence] \A[+-]?\d+
#-----| 0 -> [RegExpCaret] \A
#-----| 1 -> [RegExpOpt] [+-]?
#-----| 2 -> [RegExpPlus] \d+

#   20| [RegExpCharacterClass] [+-]
#-----| 0 -> [RegExpConstant, RegExpNormalChar] +
#-----| 1 -> [RegExpConstant, RegExpNormalChar] -

#   20| [RegExpOpt] [+-]?
#-----| 0 -> [RegExpCharacterClass] [+-]

#   20| [RegExpConstant, RegExpNormalChar] +

#   20| [RegExpConstant, RegExpNormalChar] -

#   20| [RegExpCharacterClassEscape] \d

#   20| [RegExpPlus] \d+
#-----| 0 -> [RegExpCharacterClassEscape] \d

#   21| [RegExpCharacterClass] [\w]
#-----| 0 -> [RegExpCharacterClassEscape] \w

#   21| [RegExpPlus] [\w]+
#-----| 0 -> [RegExpCharacterClass] [\w]

#   21| [RegExpCharacterClassEscape] \w

#   22| [RegExpConstant, RegExpEscape] \[

#   22| [RegExpSequence] \[\][123]
#-----| 0 -> [RegExpConstant, RegExpEscape] \[
#-----| 1 -> [RegExpConstant, RegExpEscape] \]
#-----| 2 -> [RegExpCharacterClass] [123]

#   22| [RegExpConstant, RegExpEscape] \]

#   22| [RegExpCharacterClass] [123]
#-----| 0 -> [RegExpConstant, RegExpNormalChar] 1
#-----| 1 -> [RegExpConstant, RegExpNormalChar] 2
#-----| 2 -> [RegExpConstant, RegExpNormalChar] 3

#   22| [RegExpConstant, RegExpNormalChar] 1

#   22| [RegExpConstant, RegExpNormalChar] 2

#   22| [RegExpConstant, RegExpNormalChar] 3

#   23| [RegExpCharacterClass] [^A-Z]
#-----| 0 -> [RegExpCharacterRange] A-Z

#   23| [RegExpConstant, RegExpNormalChar] A

#   23| [RegExpCharacterRange] A-Z
#-----| 0 -> [RegExpConstant, RegExpNormalChar] A
#-----| 1 -> [RegExpConstant, RegExpNormalChar] Z

#   23| [RegExpConstant, RegExpNormalChar] Z

#   24| [RegExpCharacterClass] []]
#-----| 0 -> [RegExpConstant, RegExpNormalChar] ]

#   24| [RegExpConstant, RegExpNormalChar] ]

#   25| [RegExpCharacterClass] [^]]
#-----| 0 -> [RegExpConstant, RegExpNormalChar] ]

#   25| [RegExpConstant, RegExpNormalChar] ]

#   26| [RegExpCharacterClass] [^-]
#-----| 0 -> [RegExpConstant, RegExpNormalChar] -

#   26| [RegExpConstant, RegExpNormalChar] -

#   27| [RegExpCharacterClass] [|]
#-----| 0 -> [RegExpConstant, RegExpNormalChar] |

#   27| [RegExpConstant, RegExpNormalChar] |

#   30| [RegExpCharacterClass] [[a-f]
#-----| 0 -> [RegExpConstant, RegExpNormalChar] [
#-----| 1 -> [RegExpCharacterRange] a-f

#   30| [RegExpSequence] [[a-f]A-F]
#-----| 0 -> [RegExpCharacterClass] [[a-f]
#-----| 1 -> [RegExpConstant, RegExpNormalChar] A-F]

#   30| [RegExpConstant, RegExpNormalChar] [

#   30| [RegExpConstant, RegExpNormalChar] a

#   30| [RegExpCharacterRange] a-f
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a
#-----| 1 -> [RegExpConstant, RegExpNormalChar] f

#   30| [RegExpConstant, RegExpNormalChar] f

#   30| [RegExpConstant, RegExpNormalChar] A-F]

#   33| [RegExpDot] .

#   33| [RegExpStar] .*
#-----| 0 -> [RegExpDot] .

#   34| [RegExpDot] .

#   34| [RegExpStar] .*
#-----| 0 -> [RegExpDot] .

#   35| [RegExpCharacterClassEscape] \w

#   35| [RegExpPlus] \w+
#-----| 0 -> [RegExpCharacterClassEscape] \w

#   35| [RegExpSequence] \w+\W
#-----| 0 -> [RegExpPlus] \w+
#-----| 1 -> [RegExpCharacterClassEscape] \W

#   35| [RegExpCharacterClassEscape] \W

#   36| [RegExpCharacterClassEscape] \s

#   36| [RegExpSequence] \s\S
#-----| 0 -> [RegExpCharacterClassEscape] \s
#-----| 1 -> [RegExpCharacterClassEscape] \S

#   36| [RegExpCharacterClassEscape] \S

#   37| [RegExpCharacterClassEscape] \d

#   37| [RegExpSequence] \d\D
#-----| 0 -> [RegExpCharacterClassEscape] \d
#-----| 1 -> [RegExpCharacterClassEscape] \D

#   37| [RegExpCharacterClassEscape] \D

#   38| [RegExpCharacterClassEscape] \h

#   38| [RegExpSequence] \h\H
#-----| 0 -> [RegExpCharacterClassEscape] \h
#-----| 1 -> [RegExpCharacterClassEscape] \H

#   38| [RegExpCharacterClassEscape] \H

#   39| [RegExpConstant, RegExpEscape] \n

#   39| [RegExpSequence] \n\r\t
#-----| 0 -> [RegExpConstant, RegExpEscape] \n
#-----| 1 -> [RegExpConstant, RegExpEscape] \r
#-----| 2 -> [RegExpConstant, RegExpEscape] \t

#   39| [RegExpConstant, RegExpEscape] \r

#   39| [RegExpConstant, RegExpEscape] \t

#   42| [RegExpSpecialChar] \G

#   42| [RegExpSequence] \Gabc
#-----| 0 -> [RegExpSpecialChar] \G
#-----| 1 -> [RegExpConstant, RegExpNormalChar] abc

#   42| [RegExpConstant, RegExpNormalChar] abc

#   43| [RegExpSpecialChar] \b

#   43| [RegExpSequence] \b!a\B
#-----| 0 -> [RegExpSpecialChar] \b
#-----| 1 -> [RegExpConstant, RegExpNormalChar] !a
#-----| 2 -> [RegExpNonWordBoundary] \B

#   43| [RegExpConstant, RegExpNormalChar] !a

#   43| [RegExpNonWordBoundary] \B

#   46| [RegExpGroup] (foo)
#-----| 0 -> [RegExpConstant, RegExpNormalChar] foo

#   46| [RegExpStar] (foo)*
#-----| 0 -> [RegExpGroup] (foo)

#   46| [RegExpSequence] (foo)*bar
#-----| 0 -> [RegExpStar] (foo)*
#-----| 1 -> [RegExpConstant, RegExpNormalChar] bar

#   46| [RegExpConstant, RegExpNormalChar] foo

#   46| [RegExpConstant, RegExpNormalChar] bar

#   47| [RegExpConstant, RegExpNormalChar] fo

#   47| [RegExpSequence] fo(o|b)ar
#-----| 0 -> [RegExpConstant, RegExpNormalChar] fo
#-----| 1 -> [RegExpGroup] (o|b)
#-----| 2 -> [RegExpConstant, RegExpNormalChar] ar

#   47| [RegExpGroup] (o|b)
#-----| 0 -> [RegExpAlt] o|b

#   47| [RegExpConstant, RegExpNormalChar] o

#   47| [RegExpAlt] o|b
#-----| 0 -> [RegExpConstant, RegExpNormalChar] o
#-----| 1 -> [RegExpConstant, RegExpNormalChar] b

#   47| [RegExpConstant, RegExpNormalChar] b

#   47| [RegExpConstant, RegExpNormalChar] ar

#   48| [RegExpGroup] (a|b|cd)
#-----| 0 -> [RegExpAlt] a|b|cd

#   48| [RegExpSequence] (a|b|cd)e
#-----| 0 -> [RegExpGroup] (a|b|cd)
#-----| 1 -> [RegExpConstant, RegExpNormalChar] e

#   48| [RegExpConstant, RegExpNormalChar] a

#   48| [RegExpAlt] a|b|cd
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a
#-----| 1 -> [RegExpConstant, RegExpNormalChar] b
#-----| 2 -> [RegExpConstant, RegExpNormalChar] cd

#   48| [RegExpConstant, RegExpNormalChar] b

#   48| [RegExpConstant, RegExpNormalChar] cd

#   48| [RegExpConstant, RegExpNormalChar] e

#   49| [RegExpGroup] (?::+)
#-----| 0 -> [RegExpPlus] :+

#   49| [RegExpSequence] (?::+)\w
#-----| 0 -> [RegExpGroup] (?::+)
#-----| 1 -> [RegExpCharacterClassEscape] \w

#   49| [RegExpConstant, RegExpNormalChar] :

#   49| [RegExpPlus] :+
#-----| 0 -> [RegExpConstant, RegExpNormalChar] :

#   49| [RegExpCharacterClassEscape] \w

#   52| [RegExpGroup] (?<id>\w+)
#-----| 0 -> [RegExpPlus] \w+

#   52| [RegExpCharacterClassEscape] \w

#   52| [RegExpPlus] \w+
#-----| 0 -> [RegExpCharacterClassEscape] \w

#   53| [RegExpGroup] (?'foo'fo+)
#-----| 0 -> [RegExpSequence] fo+

#   53| [RegExpConstant, RegExpNormalChar] f

#   53| [RegExpSequence] fo+
#-----| 0 -> [RegExpConstant, RegExpNormalChar] f
#-----| 1 -> [RegExpPlus] o+

#   53| [RegExpConstant, RegExpNormalChar] o

#   53| [RegExpPlus] o+
#-----| 0 -> [RegExpConstant, RegExpNormalChar] o

#   56| [RegExpGroup] (a+)
#-----| 0 -> [RegExpPlus] a+

#   56| [RegExpSequence] (a+)b+\1
#-----| 0 -> [RegExpGroup] (a+)
#-----| 1 -> [RegExpPlus] b+
#-----| 2 -> [RegExpBackRef] \1

#   56| [RegExpConstant, RegExpNormalChar] a

#   56| [RegExpPlus] a+
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a

#   56| [RegExpConstant, RegExpNormalChar] b

#   56| [RegExpPlus] b+
#-----| 0 -> [RegExpConstant, RegExpNormalChar] b

#   56| [RegExpBackRef] \1

#   57| [RegExpGroup] (?<qux>q+)
#-----| 0 -> [RegExpPlus] q+

#   57| [RegExpSequence] (?<qux>q+)\s+\k<qux>+
#-----| 0 -> [RegExpGroup] (?<qux>q+)
#-----| 1 -> [RegExpPlus] \s+
#-----| 2 -> [RegExpPlus] \k<qux>+

#   57| [RegExpConstant, RegExpNormalChar] q

#   57| [RegExpPlus] q+
#-----| 0 -> [RegExpConstant, RegExpNormalChar] q

#   57| [RegExpCharacterClassEscape] \s

#   57| [RegExpPlus] \s+
#-----| 0 -> [RegExpCharacterClassEscape] \s

#   57| [RegExpBackRef] \k<qux>

#   57| [RegExpPlus] \k<qux>+
#-----| 0 -> [RegExpBackRef] \k<qux>

#   60| [RegExpNamedCharacterProperty] \p{Word}

#   60| [RegExpStar] \p{Word}*
#-----| 0 -> [RegExpNamedCharacterProperty] \p{Word}

#   61| [RegExpNamedCharacterProperty] \P{Digit}

#   61| [RegExpPlus] \P{Digit}+
#-----| 0 -> [RegExpNamedCharacterProperty] \P{Digit}

#   62| [RegExpNamedCharacterProperty] \p{^Alnum}

#   62| [RegExpRange] \p{^Alnum}{2,3}
#-----| 0 -> [RegExpNamedCharacterProperty] \p{^Alnum}

#   63| [RegExpCharacterClass] [a-f\p{Digit}]
#-----| 0 -> [RegExpCharacterRange] a-f
#-----| 1 -> [RegExpNamedCharacterProperty] \p{Digit}

#   63| [RegExpPlus] [a-f\p{Digit}]+
#-----| 0 -> [RegExpCharacterClass] [a-f\p{Digit}]

#   63| [RegExpConstant, RegExpNormalChar] a

#   63| [RegExpCharacterRange] a-f
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a
#-----| 1 -> [RegExpConstant, RegExpNormalChar] f

#   63| [RegExpConstant, RegExpNormalChar] f

#   63| [RegExpNamedCharacterProperty] \p{Digit}

#   66| [RegExpCharacterClass] [[:alpha:]]
#-----| 0 -> [RegExpNamedCharacterProperty] [:alpha:]

#   66| [RegExpSequence] [[:alpha:]][[:digit:]]
#-----| 0 -> [RegExpCharacterClass] [[:alpha:]]
#-----| 1 -> [RegExpCharacterClass] [[:digit:]]

#   66| [RegExpNamedCharacterProperty] [:alpha:]

#   66| [RegExpCharacterClass] [[:digit:]]
#-----| 0 -> [RegExpNamedCharacterProperty] [:digit:]

#   66| [RegExpNamedCharacterProperty] [:digit:]

#   69| [RegExpCharacterClass] [[:alpha:][:digit:]]
#-----| 0 -> [RegExpNamedCharacterProperty] [:alpha:]
#-----| 1 -> [RegExpNamedCharacterProperty] [:digit:]

#   69| [RegExpNamedCharacterProperty] [:alpha:]

#   69| [RegExpNamedCharacterProperty] [:digit:]

#   72| [RegExpCharacterClass] [A-F[:digit:]a-f]
#-----| 0 -> [RegExpCharacterRange] A-F
#-----| 1 -> [RegExpNamedCharacterProperty] [:digit:]
#-----| 2 -> [RegExpCharacterRange] a-f

#   72| [RegExpConstant, RegExpNormalChar] A

#   72| [RegExpCharacterRange] A-F
#-----| 0 -> [RegExpConstant, RegExpNormalChar] A
#-----| 1 -> [RegExpConstant, RegExpNormalChar] F

#   72| [RegExpConstant, RegExpNormalChar] F

#   72| [RegExpNamedCharacterProperty] [:digit:]

#   72| [RegExpConstant, RegExpNormalChar] a

#   72| [RegExpCharacterRange] a-f
#-----| 0 -> [RegExpConstant, RegExpNormalChar] a
#-----| 1 -> [RegExpConstant, RegExpNormalChar] f

#   72| [RegExpConstant, RegExpNormalChar] f

#   75| [RegExpNamedCharacterProperty] [:digit:]

#   79| [RegExpConstant, RegExpNormalChar] abc

#   82| [RegExpConstant, RegExpEscape] \u{987