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Why does this code output 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
edited 13 hours ago
Boann
37.1k1290121
asked 15 hours ago
Fuyang LiuFuyang Liu
612517
add a comment |
Why does this code output 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
edited 13 hours ago
Boann
37.1k1290121
asked 15 hours ago
Fuyang LiuFuyang Liu
612517
10
A simplification of the code that still shows the behaviour :Pattern.matches("[^[x]]", "x")returns true with JDK8 and false with JDK9+.
– Aaron
14 hours ago
add a comment |
Why does this code output 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
edited 13 hours ago
Boann
37.1k1290121
asked 15 hours ago
Fuyang LiuFuyang Liu
612517
Why does this code output 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
edited 13 hours ago
Boann
37.1k1290121
asked 15 hours ago
Fuyang LiuFuyang Liu
612517
edited 13 hours ago
Boann
37.1k1290121
asked 15 hours ago
Fuyang LiuFuyang Liu
612517
edited 13 hours ago
Boann
37.1k1290121
edited 13 hours ago
Boann
37.1k1290121
edited 13 hours ago
Boann
37.1k1290121
37.1k1290121
asked 15 hours ago
Fuyang LiuFuyang Liu
612517
asked 15 hours ago
Fuyang LiuFuyang Liu
612517
asked 15 hours ago
Fuyang LiuFuyang Liu
612517
612517
10
A simplification of the code that still shows the behaviour :Pattern.matches("[^[x]]", "x")returns true with JDK8 and false with JDK9+.
– Aaron
14 hours ago
add a comment |
10
A simplification of the code that still shows the behaviour :Pattern.matches("[^[x]]", "x")returns true with JDK8 and false with JDK9+.
– Aaron
14 hours ago
10
10
A simplification of the code that still shows the behaviour :
Pattern.matches("[^[x]]", "x") returns true with JDK8 and false with JDK9+.– Aaron
14 hours ago
A simplification of the code that still shows the behaviour :
Pattern.matches("[^[x]]", "x") returns true with JDK8 and false with JDK9+.– Aaron
14 hours ago
add a comment |
1 Answer
1
active
oldest
votes
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 fix was 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]]
answered 15 hours ago
Karol DowbeckiKarol Dowbecki
22.6k93455
6
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
15 hours ago
1
@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?
– Karol Dowbecki
15 hours ago
3
Use RegexPlanet
– Wiktor Stribiżew
15 hours ago
12
In case it's not obvious -- the OP can fix this inconsistency by changing[^[0-9-]]to[^0-9-].
– ruakh
14 hours ago
add a comment |
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1 Answer
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active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
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 fix was 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]]
answered 15 hours ago
Karol DowbeckiKarol Dowbecki
22.6k93455
6
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
15 hours ago
1
@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?
– Karol Dowbecki
15 hours ago
3
Use RegexPlanet
– Wiktor Stribiżew
15 hours ago
12
In case it's not obvious -- the OP can fix this inconsistency by changing[^[0-9-]]to[^0-9-].
– ruakh
14 hours ago
add a comment |
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 fix was 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]]
answered 15 hours ago
Karol DowbeckiKarol Dowbecki
22.6k93455
6
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
15 hours ago
1
@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?
– Karol Dowbecki
15 hours ago
3
Use RegexPlanet
– Wiktor Stribiżew
15 hours ago
12
In case it's not obvious -- the OP can fix this inconsistency by changing[^[0-9-]]to[^0-9-].
– ruakh
14 hours ago
add a comment |
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 fix was 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]]
answered 15 hours ago
Karol DowbeckiKarol Dowbecki
22.6k93455
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 fix was 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]]
answered 15 hours ago
Karol DowbeckiKarol Dowbecki
22.6k93455
edited 10 hours ago
answered 15 hours ago
Karol DowbeckiKarol Dowbecki
22.6k93455
answered 15 hours ago
Karol DowbeckiKarol Dowbecki
22.6k93455
answered 15 hours ago
Karol DowbeckiKarol Dowbecki
22.6k93455
22.6k93455
6
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
15 hours ago
1
@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?
– Karol Dowbecki
15 hours ago
3
Use RegexPlanet
– Wiktor Stribiżew
15 hours ago
12
In case it's not obvious -- the OP can fix this inconsistency by changing[^[0-9-]]to[^0-9-].
– ruakh
14 hours ago
add a comment |
6
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
15 hours ago
1
@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?
– Karol Dowbecki
15 hours ago
3
Use RegexPlanet
– Wiktor Stribiżew
15 hours ago
12
In case it's not obvious -- the OP can fix this inconsistency by changing[^[0-9-]]to[^0-9-].
– ruakh
14 hours ago
6
6
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
15 hours 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
15 hours ago
1
1
@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?
– Karol Dowbecki
15 hours ago
@WiktorStribiżew removed, thanks. Would you suggest some other online tool that supports them?
– Karol Dowbecki
15 hours ago
3
3
Use RegexPlanet
– Wiktor Stribiżew
15 hours ago
Use RegexPlanet
– Wiktor Stribiżew
15 hours ago
12
12
In case it's not obvious -- the OP can fix this inconsistency by changing
[^[0-9-]] to [^0-9-].– ruakh
14 hours ago
In case it's not obvious -- the OP can fix this inconsistency by changing
[^[0-9-]] to [^0-9-].– ruakh
14 hours ago
add a comment |
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10
A simplification of the code that still shows the behaviour :
Pattern.matches("[^[x]]", "x")returns true with JDK8 and false with JDK9+.– Aaron
14 hours ago