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| Function | Use |
|---|---|
| ? | Use this to evaluation the truth of an expression and return a value. The syntax is: condition? true expression : false expression. If the condition evaluates to "true," the true expression is returned, otherwise the false expression is returned. The specified condition must evaluate to a Boolean value. Example: MSH-3='ADM' ? 'HIS' : 'RIS' means that if the MSH-3 segment is ADM (true), the value returned will be 'RIS'; otherwise, the value returned will be 'RIS' |
| ?? | This function returns expression 2 if expression 1 is null; otherwise, it returns expression 1. The syntax is: expression1 ?? expression2. Both expressions must evaluate to string values. Example: OBR-2 ?? OBR-3 ?? 'UNKNOWN' will return "unknown" if OBR-2 and OBR 3 evaluate to null. |
| AppendSegment(segmentName) | This function allows you to append a segment with the given segment name to the end of a message. The syntax is: AppendSegment(segmentName). Example: AppendSegment(OBR-2) will append the contents of the OBR-2 segment to the end of the message. |
| Coalesce(expression1,expression2,...,expressionN) | This function returns the first value from the list of expressions. One to N expressions can be included. The syntax is: Coalesce(expression1, expression2,...,expressionN). Example: Coalesce(OBR-2,OBR-3,'UNKNOWN') will return UNKNOWN if OBR-2 and OBR-3 are empty. |
| Escape(expression) | This function encodes a string or expression with the HL7 Escape characters of the message. The syntax is: Escape(expression) Example: Escape(MSH-2) will return "\S\\R\\E\\T\". |
| FilterString(expression,allowedCharacters) | This function returns a string containing only those characters specified in allowedCharaters. For example, the source system may provide a value in a field with extra characters; you can use this function to strip out only the characters in the string you are interested in. The syntax is: FilterString(expression,allowedCharacters). The expression must evaluate to a string; allowedCharacters specifies what will be passed through the filter. Example: FilterString(AA00BB12345,12345) will return the string "12345". |
| GetDate(format='yyyyMMddhhmmss') | |
| If(condition,trueExpression,falseExpression) | |
| In(expression,string1,string2,...,stringN) | |
| IndexOf(expression,string) | |
| InTable("InTableName") | |
| Left(expression,string) | |
| Len(expression) | |
| LTrim(expression) | |
| LTrim(expression,string) | |
| Remove(expression,string1, string2,...,stringN) | |
| Replace(expression,string,string) | |
| Right(expression,string) | |
| RTrim(expression) | |
| RTrim(expression,string) | |
| Split(expression,charArray,index) | |
| SubString(expression,offset,length) | |
| Trim(expression) | |
| Trim(expression,string) | |
| UnEscape(expression |
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