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FunctX XQuery Functions

functx:index-of-string

The position(s) of a substring

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Description

The functx:index-of-string function returns one or more integers representing the position of a $substring within $arg. Overlapping substrings are not counted. If $arg does not contain $substring, the empty sequence is returned.

Arguments and Return Type

NameTypeDescription
$arg xs:string? the string
$substring xs:string the substring to find
return value xs:integer*

XQuery Function Declaration

See XSLT definition.
declare namespace functx = "http://www.functx.com";
declare function functx:index-of-string
  ( $arg as xs:string? ,
    $substring as xs:string )  as xs:integer* {

  if (contains($arg, $substring))
  then (string-length(substring-before($arg, $substring))+1,
        for $other in
           functx:index-of-string(substring-after($arg, $substring),
                               $substring)
        return
          $other +
          string-length(substring-before($arg, $substring)) +
          string-length($substring))
  else ()
 } ;

Examples

XQuery ExampleResults
functx:index-of-string('abcdabcdabcd','abc')
(1, 5, 9)
functx:index-of-string('abcd','abc')
1
functx:index-of-string('xxx','abc')
()

See Also

functx:index-of-string-firstThe first position of a substring
functx:index-of-string-lastThe last position of a substring

History

Published OnLast UpdatedContributor(s)
2006-06-272007-02-26Priscilla Walmsley, Datypic, pwalmsley@datypic.com, https://www.datypic.com
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