From: ts <decoux@...>
Date: 2002-03-17T20:35:30+09:00
Subject: [Oni Guruma] some problematic regexp


 With this version (I hope this is the latest)

pigeon% grep ONI.*VERSION *.h
regex.h:#define ONIGURUMA_VERSION           120    /* 1.2 */
pigeon% 

 It segfault with such regexp (this is just that it can have null node in
 its tree, and actually it's not tested) 

  /(?i)(*)b/
  /(?i)(abc/
  /(?i)*a/
  /a|*/         same with +?
  /a|{1}/

 I've found very strange the result given by this regexp

pigeon% ./ruby -e '/({)/ =~ "{"; puts $1'
{
pigeon% 

 when it give

pigeon% ./ruby -e '/{/ =~ "{"; puts $&'
-e:1: end pattern at left brace: /{/
pigeon% 

 Same for this regexp

pigeon% ./ruby -e '/[\]/ =~ "]"; puts $&'
]
pigeon% 


pigeon% ./ruby -e '/[\o/ =~ "o"; puts $&'
-e:1: premature end of char-class: /[\o/
pigeon% 

 I've not understood this regexp

pigeon% ./ruby -e '/()*/'
-e:1: target of repeat-qualifier is empty: /()*/
pigeon% 

 well

pigeon% ./ruby -e 'puts "ok" if /(a*)*/ =~ ""'
ok
pigeon% 

 the target can be empty in this case and it can handle it


Guy Decoux