RegexSplit resolver returning no values

[Brent Putman]

On 1/29/16 6:43 AM, Rod Widdowson wrote:
> ... and you’ve tried the extra (regex="(\\d{5})").
>
> Apart from that, pass, someone the other side of the pond should be able to
> help.  


Try one of these, works for me:

^(\d{5}).*$

^(\\d{5}).*$
For a Java String literal, you definitely need the 2nd one, with
backslash escape of the literal backslash, b/c of String literal
requirements.  Not sure about here in the IdP, I think you don't need
the escaping when the pattern input is read in as "data".  So the 1st
one might work there.

The main thing is: I don't know off-hand exactly why it doesn't work
without the anchors, but it doesn't. That's usually the first thing I
try when a regex doesn't work as I expect:  remove ambiguity and
explicitly anchor at both ends.

Fyi, here's the simple Java scratch code I wrote to test.  Mirrors what
the RegexSplit- attribute definition does:

public class RegExTest {

    public static void main(String[] args) {
        String target = "12345 some text 12/01/17";
        String patternInput = "^(\\d{5}).*$";
       
        Pattern pattern  = Pattern.compile(patternInput);
        Matcher matcher = pattern.matcher(target);
        if (matcher.matches()) {
            System.out.println("SUCCESS: matched!");
            System.out.println("Saw group 1: " + matcher.group(1));
        } else {
            System.out.println("FAIL: Didn't match!");
        }
    }

}


In that code, without the anchors, the pattern doesn't even "match" the
target string.


> I detest regexps and always have.....

That's because regexps exist in the realm of the Dark Arts, and we
prefer to live in the light...


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