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Why String.replaceAll() works differently in Java 8 from Java 9


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8















Why this piece of code outputs 02 in java-8 but o2 in java-9 or above?



"o2".replaceAll("([oO])([^[0-9-]])", "0$2")





java regex string java-8 java-9







share|improve this question




















  • 1





    A simplification of the code that still shows the behaviour : Pattern.matches("[^[x]]", "x") returns true with JDK8 and false with JDK9+.

    – Aaron
    1 hour ago


















8















Why this piece of code outputs 02 in java-8 but o2 in java-9 or above?



"o2".replaceAll("([oO])([^[0-9-]])", "0$2")





java regex string java-8 java-9







share|improve this question




















  • 1





    A simplification of the code that still shows the behaviour : Pattern.matches("[^[x]]", "x") returns true with JDK8 and false with JDK9+.

    – Aaron
    1 hour ago
















8












8








8


5






Why this piece of code outputs 02 in java-8 but o2 in java-9 or above?



"o2".replaceAll("([oO])([^[0-9-]])", "0$2")





java regex string java-8 java-9







share|improve this question
















Why this piece of code outputs 02 in java-8 but o2 in java-9 or above?



"o2".replaceAll("([oO])([^[0-9-]])", "0$2")





java regex string java-8 java-9




java regex string java-8 java-9






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 1 hour ago









nullpointer

43.3k10101200




43.3k10101200










asked 1 hour ago









Fuyang LiuFuyang Liu

492315




492315








  • 1





    A simplification of the code that still shows the behaviour : Pattern.matches("[^[x]]", "x") returns true with JDK8 and false with JDK9+.

    – Aaron
    1 hour ago
















  • 1





    A simplification of the code that still shows the behaviour : Pattern.matches("[^[x]]", "x") returns true with JDK8 and false with JDK9+.

    – Aaron
    1 hour ago










1




1





A simplification of the code that still shows the behaviour : Pattern.matches("[^[x]]", "x") returns true with JDK8 and false with JDK9+.

– Aaron
1 hour ago







A simplification of the code that still shows the behaviour : Pattern.matches("[^[x]]", "x") returns true with JDK8 and false with JDK9+.

– Aaron
1 hour ago














1 Answer
1






active

oldest

votes


















11














Most likely due to JDK-6609854 and JDK-8189343 which reported negative nested character classes handling (in your example [^[0-9-]]). This behavior was fixed in 9 and 10, but not backported to 8. The bug for Java 8 is explained as:




In Java, the negation does not apply to anything appearing in
nested [brackets]



So [^c] does not match "c", as you would expect.



[^[c]] does match "c". Not what I would expect.



[[^c]] does not match "c"



The same holds true for ranges or property expressions - if they're
inside brackets, a negation at an out level does not affect them.



[^a-z] is opposite from [^[a-z]]







share|improve this answer





















  • 4





    You can't prove the regex does not match the string at regex101, it does not support character class union. In PCRE, [^[0-9-]] matches a char that is not [, digit and - and then a ].

    – Wiktor Stribiżew
    1 hour ago













  • @WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?

    – Karol Dowbecki
    1 hour ago








  • 1





    Use RegexPlanet

    – Wiktor Stribiżew
    1 hour ago






  • 1





    In case it's not obvious -- the OP can fix this inconsistency by changing [^[0-9-]] to [^0-9-].

    – ruakh
    1 hour ago











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1 Answer
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1 Answer
1






active

oldest

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active

oldest

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active

oldest

votes









11














Most likely due to JDK-6609854 and JDK-8189343 which reported negative nested character classes handling (in your example [^[0-9-]]). This behavior was fixed in 9 and 10, but not backported to 8. The bug for Java 8 is explained as:




In Java, the negation does not apply to anything appearing in
nested [brackets]



So [^c] does not match "c", as you would expect.



[^[c]] does match "c". Not what I would expect.



[[^c]] does not match "c"



The same holds true for ranges or property expressions - if they're
inside brackets, a negation at an out level does not affect them.



[^a-z] is opposite from [^[a-z]]







share|improve this answer





















  • 4





    You can't prove the regex does not match the string at regex101, it does not support character class union. In PCRE, [^[0-9-]] matches a char that is not [, digit and - and then a ].

    – Wiktor Stribiżew
    1 hour ago













  • @WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?

    – Karol Dowbecki
    1 hour ago








  • 1





    Use RegexPlanet

    – Wiktor Stribiżew
    1 hour ago






  • 1





    In case it's not obvious -- the OP can fix this inconsistency by changing [^[0-9-]] to [^0-9-].

    – ruakh
    1 hour ago
















11














Most likely due to JDK-6609854 and JDK-8189343 which reported negative nested character classes handling (in your example [^[0-9-]]). This behavior was fixed in 9 and 10, but not backported to 8. The bug for Java 8 is explained as:




In Java, the negation does not apply to anything appearing in
nested [brackets]



So [^c] does not match "c", as you would expect.



[^[c]] does match "c". Not what I would expect.



[[^c]] does not match "c"



The same holds true for ranges or property expressions - if they're
inside brackets, a negation at an out level does not affect them.



[^a-z] is opposite from [^[a-z]]







share|improve this answer





















  • 4





    You can't prove the regex does not match the string at regex101, it does not support character class union. In PCRE, [^[0-9-]] matches a char that is not [, digit and - and then a ].

    – Wiktor Stribiżew
    1 hour ago













  • @WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?

    – Karol Dowbecki
    1 hour ago








  • 1





    Use RegexPlanet

    – Wiktor Stribiżew
    1 hour ago






  • 1





    In case it's not obvious -- the OP can fix this inconsistency by changing [^[0-9-]] to [^0-9-].

    – ruakh
    1 hour ago














11












11








11







Most likely due to JDK-6609854 and JDK-8189343 which reported negative nested character classes handling (in your example [^[0-9-]]). This behavior was fixed in 9 and 10, but not backported to 8. The bug for Java 8 is explained as:




In Java, the negation does not apply to anything appearing in
nested [brackets]



So [^c] does not match "c", as you would expect.



[^[c]] does match "c". Not what I would expect.



[[^c]] does not match "c"



The same holds true for ranges or property expressions - if they're
inside brackets, a negation at an out level does not affect them.



[^a-z] is opposite from [^[a-z]]







share|improve this answer















Most likely due to JDK-6609854 and JDK-8189343 which reported negative nested character classes handling (in your example [^[0-9-]]). This behavior was fixed in 9 and 10, but not backported to 8. The bug for Java 8 is explained as:




In Java, the negation does not apply to anything appearing in
nested [brackets]



So [^c] does not match "c", as you would expect.



[^[c]] does match "c". Not what I would expect.



[[^c]] does not match "c"



The same holds true for ranges or property expressions - if they're
inside brackets, a negation at an out level does not affect them.



[^a-z] is opposite from [^[a-z]]








share|improve this answer














share|improve this answer



share|improve this answer








edited 1 hour ago

























answered 1 hour ago









Karol DowbeckiKarol Dowbecki

22.5k93355




22.5k93355








  • 4





    You can't prove the regex does not match the string at regex101, it does not support character class union. In PCRE, [^[0-9-]] matches a char that is not [, digit and - and then a ].

    – Wiktor Stribiżew
    1 hour ago













  • @WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?

    – Karol Dowbecki
    1 hour ago








  • 1





    Use RegexPlanet

    – Wiktor Stribiżew
    1 hour ago






  • 1





    In case it's not obvious -- the OP can fix this inconsistency by changing [^[0-9-]] to [^0-9-].

    – ruakh
    1 hour ago














  • 4





    You can't prove the regex does not match the string at regex101, it does not support character class union. In PCRE, [^[0-9-]] matches a char that is not [, digit and - and then a ].

    – Wiktor Stribiżew
    1 hour ago













  • @WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?

    – Karol Dowbecki
    1 hour ago








  • 1





    Use RegexPlanet

    – Wiktor Stribiżew
    1 hour ago






  • 1





    In case it's not obvious -- the OP can fix this inconsistency by changing [^[0-9-]] to [^0-9-].

    – ruakh
    1 hour ago








4




4





You can't prove the regex does not match the string at regex101, it does not support character class union. In PCRE, [^[0-9-]] matches a char that is not [, digit and - and then a ].

– Wiktor Stribiżew
1 hour ago







You can't prove the regex does not match the string at regex101, it does not support character class union. In PCRE, [^[0-9-]] matches a char that is not [, digit and - and then a ].

– Wiktor Stribiżew
1 hour ago















@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?

– Karol Dowbecki
1 hour ago







@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?

– Karol Dowbecki
1 hour ago






1




1





Use RegexPlanet

– Wiktor Stribiżew
1 hour ago





Use RegexPlanet

– Wiktor Stribiżew
1 hour ago




1




1





In case it's not obvious -- the OP can fix this inconsistency by changing [^[0-9-]] to [^0-9-].

– ruakh
1 hour ago





In case it's not obvious -- the OP can fix this inconsistency by changing [^[0-9-]] to [^0-9-].

– ruakh
1 hour ago




















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