Matches a string with a pattern.
The following construct(s) refer to this construct:
fn:matches(string $string, string $pattern) => boolean
fn:matches(string $string, string $pattern, string $flags) => boolean
The function returns true if $string matches the regular expression supplied as
$pattern as influenced by the value of $flags, if present;
otherwise, it returns false. This function provides patternmatching functionality which might prove
useful for users familiar with this concept. For searching in large data sets, however, it is recommended to rather use
Tamino's own text retrieval facilities for better performance.
| $sequence |
a string to be matched |
|---|---|
| $pattern |
a pattern |
| $flags |
modifiers for patternmatching |
For each author return the name and a boolean indicating whether it ends with an 'l'.
$ is an anchor character denoting the end of a string.
for $author in distinct-values(input()//author/last)
return
<author>
<name>{$author}</name>
<match>{matches($author,'l$')}</match>
</author>
The query returns the four different authors wherein Abiteboul is
marked with true. If the pattern is changed to 'l $'
Abiteboul does no longer match. It matches again when using the flag string
'x' as third parameter, since then whitespace characters in the
regular expression are removed prior to matching.