Using regular expressions in a routing rule

If  you expect to be using regular expressions frequently, it might be worth your while to write a classmethod that extends Ens.Rule.FunctionSet and wraps $MATCH or $LOCATE in something that can be called from a business rule (or DTL for that matter).

/// Custom methods for business rules and DTLs
Class User.Rule.FunctionSet Extends Ens.Rule.FunctionSet
{
/// Accepts a string <var>pString</var> and regular expression pattern <var>pPattern</var>
/// as arguments; returns 0 for no match, and a positive integer indicating the match's
/// position if there is a match.
ClassMethod REMatch(pString As %String, pPattern As %String) As %Integer
  {
              Return $LOCATE(pString,pPattern)
  }
}

You could use $MATCH instead of $LOCATE in the method above, but $MATCH() assumes the supplied pattern is begin- and end-anchored. In other words, $LOCATE("this","is") returns the positive integer 3, which for all Cache boolean purposes evaluates as true. $MATCH("this","is") returns 0 (false) since "^is$" does not match "this".

If the class you create extends Ens.Rule.FunctionSet and resides in your production's namespace, it will be selectable from the function dropdown list in both the Business Rule and DTL expression editors.

What do you mean you're not having luck? For example, what happens when you call on the $match or $locate functions on your field? I can make regex on your three examples without issue for simple strings, like below which works:

$locate("123dsd534","[a-z]")

If you're really set on using the ? notation for pattern matching, see the "ObjectScript Pattern Matching" section of the documentation. In the pattern field of the Match function in the expression editor, you would enter the pattern without a leading question mark. For example, you can use the string ".A" to match any number of upper or lowercase characters, or ".AP" to match any number of upper/lowercase and punctuation characters.

 I have a similar issue.  I'm trying to look for kids born "today" for Newborn Screening.  I've built a previous Rule Condition that looks a field in a Record Map and does a look up.  If the record map field is not found in the list then the record is skipped.

But how do I code the condition to look at the PID.7 and if that is "today" Send it along?? I can get the field value.  It's the "get today's date" I'm having trouble with.

I have this much so far "HL7.{PID.7}Contains"  

I have a routing rule that uses Matches e.g. Matches "1P4N1P1A5N1A1P" that matches against this string <0508:F00002R>

How do I include literals within the expression editor?

Pattern match doc indicates something like this 1P4N":F"5N"R"1P

Since within the expression is surrounded by double-quotes, that breaks the syntax in the editor.

Have tried many variations, none of which work.