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  1. or download this
      DB<63> print join "|",'abc' =~ /a(.+?)(c)?/
b|c
  DB<64> print join "|",'abd' =~ /a(.+?)(c)?/
b|
  2. or download this
      DB<84> print join "|",'a<c1<c2' =~ /(.+?)<(c.)?/ # ok
a|c1
...

  DB<86> print join "|",'a<b1<c2' =~ /(.+?)<(c.)?/ # oops
a|
  3. or download this
      DB<89> print join "|",'a<b1<c2' =~ /(.+?)(c.)?/
a|