.. highlightlang:: us

.. _strspn:

strspn
======

.. index:: strspn

.. us.tag  strspn NOTREADYENGLISH STR

:ref:`strspn` returns the index of the
first character in *smString1* that does not belong to the set of
characters in *ssString2*.

.. function::  smIndex = strspn(smString1, ssString2)

.. us.return

**Return Value**

*smIndex* is a matrix with the same dimension as *smString1*. Each element is the index of the first character in *smString1* that does not belong to the set of characters in *ssString2*. The index starts with 1. If all characters in *smString1* belong to the set of characters in *ssString2*, the
function return 0.

.. us.params

**Parameters**

.. uparam:: smString1

   *smString1* is a string matrix.

.. uparam:: ssString2

   *ssString2* is a scalar string.

.. seealso::
   :ref:`overview-strings`,
   :ref:`strmatch`,
   :ref:`strtok`,
   :ref:`strfindreplace`,
   :ref:`strextract`,
   :ref:`strfind`

:sub:`id-1212479`