Strange behavior with regex array and any()

[Jeff Lowery]

Something odd is happening here that I’m not able to reproduce reliably.  
Here’s a summary:
        
if (it.classes().disjoint(tooltippedClasses)) { 
        def src = it.@src
        def skipIt = /* some condition equalling */ false 
        skipIt = skipIt || [/.*adroll.*/, /.*facebook.*/, /.*googleads.*/, 
/.*adnxs.*/].any{src ==~ it}

        if (skipIt) println "skipped $src"

        if (!skipIt) {
                missing.push(src);
        }
}

skipIt is returning false for a src = "http://ib.adnxs.com/seg?add=3xxxxx8&t=2 
<http://ib.adnxs.com/seg?add=8888888&t=2>”, but only sometimes:

> skipped http://ib.adnxs.com/seg?add=3xxxxx8&t=2

Is there some side-effect I’m overlooking?  

JRE 1.8.0_25, groovy 2.4.3

— Jeff