Here https://docs.e-spirit.com/odfs/template-develo/rules/comparative-exp/matches/index.html, you write:
"The behavior of the “regex” attribute may slightly differ in SiteArchitect and in ContentCreator because of different regex engines."
For SA you provide: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html
But for CC there isn't an corresponding Link.
When my regex: ^[0-9]{8,9}+$ works in SA but not CC i want to understand why so i can at least adjust ^^
(Working CC regex: ^[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]?$ )
So could you tell us which regex engine you use for the Content Creator?