index.md

---

title: substring
slug: Web/XPath/Functions/substring

---

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The substring function returns a part of a given string.

Syntax

substring(string, start)
substring(string, start, length)

Arguments

• string

  • : The string to evaluate.

• start

  • : The position within string the substring begins

• length {{optional_inline}}

  • : The length of the substring. If omitted, the returned string will contain every character from the start position to the end of string.

Returns

A string.

Notes

As in other XPath functions, the position is not zero-based. The first character in the string has a position of 1, not 0.

Defined

XPath 1.0 4.2

Gecko support

Supported.