You mean just the space character? Not for any whitespace?
To check if a string contains only space characters, use
my $string = " ";
$string = "Default" if $string =~ /^ *$/;
This sets $string to "Default" if $string consists of
0 or more space characters, and only space characters;
if $string is " a " or something such, the regular
expression won't match.
If you're looking to match strings that consist only of
whitespace (no non-whitespace characters), use:
my $string = " \t \n ";
$string = "Default" if $string =~ /^\s*$/;
\s matches whitespace, so this does the same as the last
regex, but matches any whitespace (not just space characters).
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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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