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#1 Phrase search

Search provides the ability to search by phrase. All results are sorted by default according to the following criteria:

-full phrase match

• concepts contain all the words from the search phrase
• result based on two parameters, the number of searched words in the result and importance of each word (importance is calculated for each word, the words that are rearer among all documents are more important)

Example:

Search phrase: Stroke Myocardial Infarction Gastrointestinal Bleeding

NB: the search goes through all concept fields, but the highest priority is given to CONCEPT_NAME and CONCEPT_CODE

#2 Exact search

Using quotation marks forces an exact-match search.

For an exact search, the following conditions are met

• the word must be present
• not case sensitive, the number of spaces between words does not matter
• stemming is disabled(the word/words must be present exactly as it is in quotation marks)

Example 1:

Search phrase: "Stroke Myocardial Infarction Gastrointestinal Bleeding"

Example 2:

Search phrase: "Stroke Myocardial Infarction "Gastrointestinal Bleeding"

#3 Special symbols

For special symbols, the following conditions are met

• These special symbols are always ignored and treated as words separation symbols: / \ | ? ! , ; . e.g. "Pooh.eats?honey!" equals "Pooh eats honey"
• All other special symbols ignored only if it is a separate word: + - ( ) : ^ [ ] { } ~ * ? | & ; e.g. "Pooh ` eats raspberries - honey" equals "Pooh eats honey", but "Pooh'eats raspberries-honey" will remain the same
• the first funded result will be with characters and then without

Search phrase: [hip]

A special character becomes mandatory if the word is surrounded by quotation marks.

Search phrase: "[hip]"

#4 Approximate matching(fuzzy searching)

In case of a typo, or if there is a similar spelling of the word, the most similar result will be found

Search phrase: Strok Myocardi8 Infarctiin Gastrointestinal Bleedi