Steve Lawrence created DAFFODIL-2001:
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Summary: Regex patterns not validated correctly with newer
versions of Java
Key: DAFFODIL-2001
URL: https://issues.apache.org/jira/browse/DAFFODIL-2001
Project: Daffodil
Issue Type: Bug
Components: Front End
Affects Versions: 2.3.0
Reporter: Steve Lawrence
Fix For: 2.3.0
According to the DFDL spec, only regex features available in both Java 7 and
ICU are allowed, and other features should cause an SDE. To check this, we
simply compile a regex with both Java and ICU, and if either fails then we
assume the regex is invalid, either because it actually is invalid or it uses a
feature that the DFDL spec does not allow.
However, newer versions of Java support newer regex capabilities, so some
regex's that are invalid in Java 7 are valid in later Java versions. This means
that when using a new version of Java, a regex could be allowed that isn't
portable and isn't valid according to the DFDL spec.
So we should manually inspect regular expressions rather for validity than
relying on the Java/ICU regex compilers to determine if a regular expression is
DFDL compliant and issue an error, or issue a warning that the regex may
contain non-portable features, perhaps controlled by a tunable.
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