Andy Seaborne created JENA-740:
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Summary: SPARQL replace
Key: JENA-740
URL: https://issues.apache.org/jira/browse/JENA-740
Project: Apache Jena
Issue Type: Improvement
Components: ARQ
Affects Versions: Jena 2.11.2
Reporter: Andy Seaborne
Priority: Minor
http://mail-archives.apache.org/mod_mbox/jena-users/201407.mbox/%3CCA%2BQ4Jn%3DqOS85yCPGexqX%2BLFkX4Dw8QSQmBLq2kT05%2Btvj0xksA%40mail.gmail.com%3E
{{replace("abc", ".*", "x")}} returns {{"xx"}} because it uses Java's
Matcher.replaceAll - it's one match for the whole of "abc" (it's a greedy
pattern) and one match for the trailing empty string. Java returns {{"x"}} for
an empty string, and {{"xx"}} for any non-empty string in place of "abc".
F&O calls out this case and makes it an error.
http://www.w3.org/TR/xpath-functions/#func-replace
{quote}
An error is raised \[err:FORX0003\] if the pattern matches a zero-length
string, that is, if the expression fn:matches("", $pattern, $flags) returns
true. It is not an error, however, if a captured substring is zero-length.
{quote}
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