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< 64572001 |Disease| {{ term = ("heart" "card")}}

The other match technique that may be used is a wildcard matchsearch.  This uses an technique is specified using the keyword "wild:" and matches the search term in the expression constraint against the entire candidate description term (rather than just individual words).  An asterisk ('*') is used as a wildcard to indicate that any (zero to many) characters may appear in the given position, and is specified using the keyword "wild:" before the search term.

For example, the expression constraint below will match only diseases with a description term starting with "cardi" and ending with "opathy" with any number of characters between. This term filter would therefore match on terms such as "cardiopathy", "cardiomyopathy" and "cardiac channelopathy", but would not match on terms like "atrial cardiopathy" or "Cardiomyopathy (disorder)".

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< 64572001 |Disease| {{ term = wild:"cardi*opathy"}}

Please note that to perform an exact string match on an entire term, a wildcard search without a wildcard can be used (e.g. term=wild:"cardiopathy"). For example, the following expression constraint will match only diseases with a description term that exactly matches the full string "cardiopathy". This expression constraint will therefore match the concept 

< 64572001 |Disease| {{ term = wild:"cardiopathy"}}

It is also possible to mix the match techniques in a search term set. For example, the expression constraint below will match those diseases with a description term that either contains a word starting with "gas", or ending with "itis" - e.g. "gastric flu", "gastritis", or "tonsillitis".

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