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# Subject: [stolfi@ic.unicamp.br: Bug in [...]* matching with acute-u]
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# From: Jorge Stolfi <stolfi@ic.unicamp.br>
# To: bug-gnu-utils@gnu.org
# Subject: Bug in [...]* matching with acute-u
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# 
# 
# Hi,
# 
# I think I have run into a bug in gawk's handling of REs of the
# form [...]* when the bracketed list includes certain 8-bit characters,
# specifically u-acute (octal \372).
# 
# The problem occurs in GNU Awk 3.0.4, both under 
# Linux 2.2.14-5.0 (intel i686) and SunOS 5.5 (Sun sparc).
# 
# Here is a program that illustrates the bug, and its output.
# The first two lines of the output should be equal, shouldn't they?
# 
# ----------------------------------------------------------------------
#! /usr/bin/gawk -f

BEGIN {
  s = "bananas and ananases in canaan";
  t = s; gsub(/[an]*n/, "AN", t);   printf "%-8s  %s\n", "[an]*n", t;
  t = s; gsub(/[anú]*n/, "AN", t);  printf "%-8s  %s\n", "[anú]*n", t;
  print "";
  t = s; gsub(/[aú]*n/, "AN", t);   printf "%-8s  %s\n", "[aú]*n", t;
  print "";
  t = s; gsub(/[an]n/, "AN", t);    printf "%-8s  %s\n", "[an]n", t;
  t = s; gsub(/[aú]n/, "AN", t);    printf "%-8s  %s\n", "[aú]n", t;
  t = s; gsub(/[anú]n/, "AN", t);   printf "%-8s  %s\n", "[anú]n", t;
  print "";
  t = s; gsub(/[an]?n/, "AN", t);   printf "%-8s  %s\n", "[an]?n", t;
  t = s; gsub(/[aú]?n/, "AN", t);   printf "%-8s  %s\n", "[aú]?n", t;
  t = s; gsub(/[anú]?n/, "AN", t);  printf "%-8s  %s\n", "[anú]?n", t;
  print "";
  t = s; gsub(/[an]+n/, "AN", t);   printf "%-8s  %s\n", "[an]+n", t;
  t = s; gsub(/[aú]+n/,  "AN", t);  printf "%-8s  %s\n", "[aú]+n", t;
  t = s; gsub(/[anú]+n/, "AN", t);  printf "%-8s  %s\n", "[anú]+n", t;
}
# ----------------------------------------------------------------------
# [an]*n    bANas ANd ANases iAN cAN
# [anú]*n   bananas and ananases in canaan
# 
# [aú]*n    bANANas ANd ANANases iAN cANAN
# 
# [an]n     bANANas ANd ANANases in cANaAN
# [aú]n     bANANas ANd ANANases in cANaAN
# [anú]n    bANANas ANd ANANases in cANaAN
# 
# [an]?n    bANANas ANd ANANases iAN cANaAN
# [aú]?n    bANANas ANd ANANases iAN cANaAN
# [anú]?n   bANANas ANd ANANases iAN cANaAN
# 
# [an]+n    bANas ANd ANases in cAN
# [aú]+n    bANANas ANd ANANases in cANAN
# [anú]+n   bananas and ananases in canaan
# ----------------------------------------------------------------------
# 
# Apparently the problem is specific to u-acute; I've tried several
# other 8-bit characters and they seem to behave as expected.
# 
# By comparing the second and third output lines, it would seem that the
# problem involves backtracking out of a partial match of [...]* in
# order to match the next sub-expression, when the latter begins with
# one of the given characters.
# 
# 
# All the best,
# 
# --stolfi
# 
# ------------------------------------------------------------------------
# Jorge Stolfi | http://www.dcc.unicamp.br/~stolfi | stolfi@dcc.unicamp.br 
# Institute of Computing (formerly DCC-IMECC)      | Wrk +55 (19)3788-5858
# Universidade Estadual de Campinas (UNICAMP)      |     +55 (19)3788-5840
# Av. Albert Einstein 1251 - Caixa Postal 6176     | Fax +55 (19)3788-5847
# 13083-970 Campinas, SP -- Brazil                 | Hom +55 (19)3287-4069                 
# ------------------------------------------------------------------------
# 
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