Anchoring in XML Schema 1.1

[ldeichmann]

Hi,

while playing around with regexml, I've tried my hand at a few simple regular expression using the XML Schema 1.1 mode.
At least from my understanding of XML Schema 1.1 Regex, all expressions are anchored by default, but the following example does not work as I would expected, as it seems to be enough for a fragment of the input to match the regular expression.

fn main() {
    let reg = regexml::Regex::xsd("[0-9]{4}", "").unwrap();
    // must match
    assert!(reg.is_match("1234"));
    // must not match
    assert!(!reg.is_match("abc1234def"));
}

Manually anchoring the expression, i.e. using ^[0-9]{4}$, makes even 1234 not match the regular expression, so that's probably not the right move. Not sure if I am maybe missing a flag, but from the ones I see I'm not certain they have an influence on this.

regexml version: 0.2.1
rust version: 1.85.1

Thanks for providing the library, I'm amazed that this topic is receiving attention in native Rust!

[faassen]

It's quite possible that schema mode isn't working correctly. I only had xpath tests and something might either have gone wrong in the transcription from Java or less likely but still possible in the original Saxon regex engine.

I would be happy to see tests and fixes to make this mode works as expected!