Tamino XQuery User Guide - Software AG Documentation

Text Retrieval
Wildcard Characters
In contrast to the maskcard character, which matches exactly one character, the wildcard character
matches zero or more characters in a word. By default, the wildcard character is an asterisk "*".
Consider the following query:
let $text := text{"one, two"}
return tf:containsAdjacentText($text, 1, "one", "*", "*")
This query returns false, since tf:containsAdjacentText expects two word tokens adjacent to
"one".
If you use the default tokenizer, i.e. the white space-separated tokenizer, then the wildcard character
is always the asterisk "*" (Unicode value U+002A).
Using the Japanese Tokenizer
If you use the Japanese tokenizer, all of the following characters are recognized as wildcard characters:
Unicode Name
ASTERISK
ARABIC FIVE POINTED STAR
ASTERISK OPERATOR
HEAVY ASTERISK
SMALL ASTERISK
FULL WIDTH ASTERISK
Code Value
U+002A
U+066D
U+2217
U+2731
U+FE61
U+FF0A
Note: In contrast to the standard white space-separated tokenizer, this definition of wildcard
characters is fixed and cannot be changed.
The Japanese tokenizer does not support wildcard characters in the middle of a word, since there
are no explicit delimiter characters. So " * " will be treated as " *" adj " ".
The example queries below focus on the contents of the patient/submitted/diagnosis nodes to
show the effect of performing search operations with or without wildcard characters on segmentation
of Japanese words.
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XQuery User Guide