Lex.pair.ok: def of cswap-bend-cli@0.1.0.0
Import: import cswap-bend-cli@0.1.0.0/json/lex.bend as Lex
Lines 160-162 of cswap-bend-cli@0.1.0.0/json/lex.bend: https://jend.leeeet.dev/read.txt?path=cswap-bend-cli@0.1.0.0/json/lex.bend&start_line=160&end_line=162

import Base

# After \uD83D: is the next escape a \uDC00..\uDFFF low half?
def pair.ok(+u1: U32, +t5: String) -> Bool:
  is_hi(u1) && U32.is_eq(cc(t5, 0n), 92) && U32.is_eq(cc(t5, 1n), 117) && is_lo(hex4(String.drop(t5, 2n)))

Uses (10):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=String.drop
  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=cswap-bend-cli@0.1.0.0/json/lex.bend&name=cc
  https://jend.leeeet.dev/definition.txt?path=cswap-bend-cli@0.1.0.0/json/lex.bend&name=hex4
  https://jend.leeeet.dev/definition.txt?path=cswap-bend-cli@0.1.0.0/json/lex.bend&name=is_hi
  https://jend.leeeet.dev/definition.txt?path=cswap-bend-cli@0.1.0.0/json/lex.bend&name=is_lo