find a space in a string, better fast solution?

From	albert <alstopspam@stopaspam.com>
Newsgroups	comp.lang.php
Subject	find a space in a string, better fast solution?
Date	2015-11-14 11:58 +0100
Organization	Aioe.org NNTP Server
Message-ID	<n2744a$2v9$1@speranza.aioe.org> (permalink)

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If I have this
xx/yy/178 234 38
the space are only between the numbers (if there are number)

which is the most fast solution for know if after first number there is 
a space?

1 Find the space for all the string       ?
2 find the space after last occurency /   ?



I need to do this:
I can have this
xx/yy/178 234 38    I have 2 spaces: do nothing
xx/yy/200           No spaces:       take the value 200
xx/yy/200 45        I have 1 space: do nothing
xx/yy/             I have 1 space: do nothing because haven't the number

If in the string I have one space I do nothing
If I haven't space I need take first(and the unique) number

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find a space in a string, better fast solution? albert <alstopspam@stopaspam.com> - 2015-11-14 11:58 +0100
  Re: find a space in a string, better fast solution? Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-14 13:08 +0100
  Re: find a space in a string, better fast solution? Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-14 09:18 -0500

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