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FunctX XQuery Functions

functx:index-of-string-first

The first position of a substring

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Description

The functx:index-of-string-first function returns an integer representing the first position of $substring within $arg. 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-first
  ( $arg as xs:string? ,
    $substring as xs:string )  as xs:integer? {

  if (contains($arg, $substring))
  then string-length(substring-before($arg, $substring))+1
  else ()
 } ;

Examples

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

See Also

functx:index-of-stringThe position(s) of a substring
functx:index-of-string-lastThe last position of a substring
fn:containsWhether one string contains another

History

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