Check whether string 1 starts with string 2

Related Syntax Constructs

The following construct(s) refer to this construct:

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Syntax

fn:starts-with(string $string, string $startString) => boolean

fn:starts-with(string $string, string $startString, string $collation) => boolean

Description

This function checks whether or not the value of $string starts with the value of $startString. If the value of $startString is a string of length zero, the function returns true. If the value of $string is a string of length zero, but the value of $startString is not, the function returns false. If the value of either string is the empty sequence, the function returns the empty sequence.

Arguments

$string	string value
$startString	string value to be searched for in $string
$collation	optional valid collation string literal

Example

• Select all patients that have some form of angina:

  for $a in input()/patient
  let $b := $a/submitted/diagnosis
  where starts-with($b, "Angina")
  return $a/name