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https://issues.apache.org/jira/browse/LUCENE-4078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284080#comment-13284080
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Hoss Man commented on LUCENE-4078:
----------------------------------
bq. When you think of it '|' is not an operator ...
I'm not really following you there ... '|' is the OR operator, so the regex "|"
is a redundant way of saying "" which is "the empty pattern" or a way of saying
"match the empty string".
Consider in particular when the regex is used for a replace or split type
operation: "z|" means "match z or the empty string"...
{code}
$ perl -MData::Dumper -le 'print Dumper split /z|/, "ABzCD";'
$VAR1 = 'A';
$VAR2 = 'B';
$VAR3 = 'C';
$VAR4 = 'D';
{code}
You should see similar results in java with if you use Matcher.find() as an
iterator.
As for the original pattern: "]|" -- that's just a convince form of "\]|" .. an
unescaped close bracket (that has no matching open bracket) is treated as a
literal...
{code}
$ perl -MData::Dumper -le 'print Dumper split /]|/, "AB]CD";'
$VAR1 = 'A';
$VAR2 = 'B';
$VAR3 = 'C';
$VAR4 = 'D';
{code}
What i can't explain, is why java treats "empty string" as something that
matches in the middle of a code point. that certainly sounds like bug, unless
there is some subtlety in Unicode TR#18 that i'm not seeing...
http://www.unicode.org/reports/tr18/
> PatternReplaceCharFilter assertion error
> ----------------------------------------
>
> Key: LUCENE-4078
> URL: https://issues.apache.org/jira/browse/LUCENE-4078
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Minor
> Fix For: 4.0
>
>
> Build: https://builds.apache.org/job/Lucene-trunk/1942/
> 1 tests failed.
> REGRESSION:
> org.apache.lucene.analysis.pattern.TestPatternReplaceCharFilter.testRandomStrings
> Error Message:
> Stack Trace:
> java.lang.AssertionError
> at
> __randomizedtesting.SeedInfo.seed([8E91A6AC395FEED9:618A6129A5BB9EC]:0)
> at
> org.apache.lucene.analysis.MockTokenizer.readCodePoint(MockTokenizer.java:153)
> at
> org.apache.lucene.analysis.MockTokenizer.incrementToken(MockTokenizer.java:123)
> at
> org.apache.lucene.analysis.BaseTokenStreamTestCase.checkAnalysisConsistency(BaseTokenStreamTestCase.java:558)
> at
> org.apache.lucene.analysis.BaseTokenStreamTestCase.checkRandomData(BaseTokenStreamTestCase.java:488)
> at
> org.apache.lucene.analysis.BaseTokenStreamTestCase.checkRandomData(BaseTokenStreamTestCase.java:430)
> at
> org.apache.lucene.analysis.BaseTokenStreamTestCase.checkRandomData(BaseTokenStreamTestCase.java:424)
> at
> org.apache.lucene.analysis.pattern.TestPatternReplaceCharFilter.testRandomStrings(TestPatternReplaceCharFilter.java:323)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:616)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1969)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner.access$1100(RandomizedRunner.java:132)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:814)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:875)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:889)
> at
> org.apache.lucene.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:50)
> at
> org.apache.lucene.util.TestRuleFieldCacheSanity$1.evaluate(TestRuleFieldCacheSanity.java:32)
> at
> org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
> at
> com.carrotsearch.randomizedtesting.rules.SystemPropertiesInvariantRule$1.evaluate(SystemPropertiesInvariantRule.java:55)
> at
> org.apache.lucene.util.TestRuleReportUncaughtExceptions$1.evaluate(TestRuleReportUncaughtExceptions.java:68)
> at
> org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:48)
> at
> org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:48)
> at
> com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(Randomized
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