Thank you,. Alexander.

Really didn't think that it could be any undefined variable.

Thank you, Robert!

I'll file a prodlog (about the docs), so we'll see.

Yes, tested it in Ensemble 2017.2 and InterSystems IRIS 2018.1.

About everything quoted is a valid property name:

Property "WHY( *?""*?";

Thank you, John!

Looks like it is exactly what I heed.

If someone is interested, here's the same code but as a class:

/// Utility to match input against comma-separated string of masks.
Class util.Matcher
{

/// Returns $$$YES if input matches at least one element from the list
/// input - string to match
/// list - comma separated list of masks containig * and ?
/// write ##class(util.Matcher).MatchOr()
ClassMethod MatchOr(input As %String, list As %String) As %Boolean
{
    set ok = $$$NO
    for pie=1:1:$L(list,",") {
        set mask=$P(list,",",pie)
        if mask'="",..Match(input,mask) {
            set ok = $$$YES
        }
    }
    quit ok
}

/// Returns $$$YES if input matches all elements from the list
/// input - string to match
/// list - comma separated list of masks containig * and ?
/// write ##class(util.Matcher).MatchAnd()
ClassMethod MatchAnd(input As %String, list As %String) As %Boolean
{
    set ok = $$$YES
    for pie=1:1:$L(list,",") {
        set mask=$P(list,",",pie)
        if mask'="",'..Match(input,mask) {
            set ok = $$$NO
        }
    }
     quit ok
}

/// Returns $$$YES if input matches the mask
/// write ##class(util.Matcher).Match()
ClassMethod Match(input As %String, mask As %String) As %Boolean [ CodeMode = expression ]
{
input?@..MaskToPattern(mask)
}

/// Translate mask into a pattern
/// write ##class(util.Matcher).MaskToPattern()
ClassMethod MaskToPattern(mask As %String) As %String
{
    set pattern = ""
    set char = ""
    for pos = 1:1:$length(mask) {
        set curChar = $extract(mask, pos)
        if curChar = "*" {
            set pattern = pattern _ $select(char="":"", 1:"1"""_char_"""") _ ".E"
            set char = ""
        } elseif curChar = "?" {
            set pattern = pattern _ $select(char="":"", 1:"1"""_char_"""") _ "1E"
            set char = ""
        } else {
            set char = char _ curChar
        }
    }
    set pattern = pattern _ $select(char="":"", 1:"1"""_char_"""")
    quit pattern
}

}