Regex.lex.step: def of bend-kit-regex@0.8.0.0
Import: import bend-kit-regex@0.8.0.0/regex.bend as Regex
Lines 340-376 of bend-kit-regex@0.8.0.0/regex.bend: https://jend.leeeet.dev/read.txt?path=bend-kit-regex@0.8.0.0/regex.bend&start_line=340&end_line=376

import Base

def lex.step(s: String, toks: List<&2, Tok>) -> Lx:
  match s:
    case SNil{}:
      LDone{toks}
    case SCon{'\\', t}:
      lex.esc(esc(t), toks)
    case SCon{'[', SCon{'^', t}}:
      lex.class(True{}, class(t, True{}), toks)
    case SCon{'[', t}:
      lex.class(False{}, class(t, True{}), toks)
    case SCon{'(', SCon{'?', SCon{':', t}}}:
      LGo{t, TOpen{False{}} <> toks}
    case SCon{'(', SCon{'?', t}}:
      LFail{}
    case SCon{'(', t}:
      LGo{t, TOpen{True{}} <> toks}
    case SCon{')', t}:
      LGo{t, TClose{} <> toks}
    case SCon{'|', t}:
      LGo{t, TBar{} <> toks}
    case SCon{'*', t}:
      lex.rep(0, None{}, t, toks)
    case SCon{'+', t}:
      lex.rep(1, None{}, t, toks)
    case SCon{'?', t}:
      lex.rep(0, Some{1}, t, toks)
    case SCon{'{', +t}:
      +m = num(t)
      lex.brace.min(U32.is_eq(Num.n(m), 0), m, t, toks)
    case SCon{'.', t}:
      LGo{t, TAtom{NSet{True{}, [Rng{10, 10}]}} <> toks}
    case SCon{'^', t}:
      LGo{t, TAtom{NAssert{0}} <> toks}
    case SCon{'$', t}:
      LGo{t, TAtom{NAssert{1}} <> toks}
    case SCon{Chr{+c}, t}:
      LGo{t, TAtom{lit(c)} <> toks}

Uses (22):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Char
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Maybe
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.is_eq
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Word.Con
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Word.Nil
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=Item
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=Lx
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=Node
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=Num.n
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=Tok
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=class
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=esc
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=lex.brace.min
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=lex.class
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=lex.esc
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=lex.rep
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=lit
  https://jend.leeeet.dev/definition.txt?path=bend-kit-regex@0.8.0.0/regex.bend&name=num