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  1. $text = "asssssaasssxaasaayaaa";
  2. print "Before: $text\n";
  3. $text =~ s/(?:\G([^xa]*?)a|()a(?!.*y))/$1A/g;
  4. print "After: $text\n";
  5. print "-----\n";
  6. $text = "asssssaasssxaasaxayayaaa";
  7. print "Before: $text\n";
  8. $text =~ s/(?:\G([^xa]*?)a|()a(?!.*y))/$1A/g;
  9. print "After: $text\n";
  10. print "-----\n";
  11. $text = "asssssaasssxaasayaxayaaa";
  12. print "Before: $text\n";
  13. $text =~ s/(?:\G([^xa]*?)a|()a(?!.*y))/$1A/g;
  14. print "After: $text\n";
  15.  
Success #stdin #stdout 0s 4552KB
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stdin
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Standard input is empty
stdout
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Before: asssssaasssxaasaayaaa
After: AsssssAAsssxaasaayAAA
-----
Before: asssssaasssxaasaxayayaaa
After: AsssssAAsssxaasaxayayAAA
-----
Before: asssssaasssxaasayaxayaaa
After: AsssssAAsssxaasayaxayAAA
https://ideone.com/MmqIY
language:
Perl (perl 5.28.1)
created:
11 years ago
visibility:
public

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