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    <p><a href="http://www.ruby-doc.org/docs/ProgrammingRuby/" rel="noreferrer">Programming Ruby</a> mentions them in the <a href="http://www.ruby-doc.org/docs/ProgrammingRuby/html/tut_stdtypes.html" rel="noreferrer">chapter about strings</a>.</p> <p>Related to <code>%q{}</code> and <code>%Q{}</code> is <code>%{}</code> which is the same as <code>%Q{}</code>. Also, the delimiters "<code>{}</code>" I show can be a matching pair of delimiters, so you could use <code>[]</code>, <code>()</code>, etc. <code>%q{}</code> is the same as using single-quotes to delimit a string. <code>%Q{}</code> is the same as using double-quotes, allowing embedded strings to be interpolated:</p> <pre><code>%q{foobar} # =&gt; "foobar" %Q{foobar} # =&gt; "foobar" asdf = 'bar' # =&gt; "bar" %q{foo#{asdf}} # =&gt; "foo\#{asdf}" %Q{foo#{asdf}} # =&gt; "foobar" </code></pre> <p>Also, there is <code>%w{}</code> which splits a string using whitespace, into an array. For instance:</p> <pre><code>%w[a b c] # =&gt; ["a", "b", "c"] </code></pre> <p><code>%w{}</code> doesn't interpolate embedded variables:</p> <pre><code>%w[a b asdf] # =&gt; ["a", "b", "asdf"] %w[a b #{asdf}] # =&gt; ["a", "b", "\#{asdf}"] </code></pre> <p>And <code>%r{}</code> which defines a regular expression:</p> <pre><code>%r{^foo}.class # =&gt; Regexp </code></pre> <p>Finally there is <code>%x{}</code> which acts like backticks, i.e. "``", passing the string to the underlying operating system. Think of it as "exec":</p> <pre><code>%x{date} # =&gt; "Fri Nov 26 15:08:44 MST 2010\n" </code></pre> <p>A lot of Ruby's ideas for these shortcuts come from Perl, only in Perl they use <code>q{}</code>, <code>qq{}</code>, <code>qw{}</code>, <code>qx{}</code> and <code>qr{}</code>. The leading <code>q</code> stands for "quote", and they are treated and documented as "quoting" operators if I remember right. Ruby's documentation needs to be expanded, and this particular set of tools could definitely use some help.</p>
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    1. POWhere in the Ruby language is %q, %w, etc., defined?
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    1. USthe Tin Man
    1. USthe Tin Man
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      1. VTUpMod
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    1. COOne correction % is equivalent to %Q and not %q. So you can use %(text#{some_var})
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      1. USNick Zalutskiy
    2. COCorrect. Good catch. I probably fat-fingered the shift key. I'll touch it up.
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      1. USthe Tin Man
    3. CORuby docs uses %r in examples without matching delimiters. For example in Class String you can see this: `a.scan(%r\w+/) `. It seems to have a closing '/'. I can't find any where that this usage is documented.
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