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Pastable version of Is This String Postal?

<div style="overflow:auto;border:solid 1px #ccc;background:#000;color:#F8F8F8"> <div class="section"> <pre style="float:left;margin:0 10px;border-right:0;color:#666;">1 2 3 4 5</pre> <pre class="sunburst"><span style="color:#E28964;">class</span> <span style="text-decoration:underline;">String</span> <span style="color:#E28964;">def</span> <span style="color:#89BDFF;">postal?</span> <span style="color:#3E87E3;">self</span>.<span style="color:#89BDFF;">match</span>(<span style="color:#E9C062;"><span style="color:#E9C062;">/</span></span><span style="color:#E9C062;"><span style="color:#E9C062;"><span style="color:#E9C062;">[</span>a-zA-Z<span style="color:#E9C062;">]</span></span><span style="color:#CF7D34;"><span style="color:#CF7D34;">{</span>1<span style="color:#CF7D34;">}</span></span><span style="color:#CF7D34;">\d</span><span style="color:#CF7D34;"><span style="color:#CF7D34;">{</span>1<span style="color:#CF7D34;">}</span></span><span style="color:#E9C062;"><span style="color:#E9C062;">[</span>a-zA-Z<span style="color:#E9C062;">]</span></span><span style="color:#CF7D34;"><span style="color:#CF7D34;">{</span>1<span style="color:#CF7D34;">}</span></span><span style="color:#E9C062;"><span style="color:#E9C062;">(</span><span style="color:#E9C062;"><span style="color:#E9C062;">[</span><span style="color:#CF7D34;">\x20</span>-<span style="color:#E9C062;">]</span></span><span style="color:#E9C062;">)</span></span>*<span style="color:#CF7D34;">\d</span><span style="color:#CF7D34;"><span style="color:#CF7D34;">{</span>1<span style="color:#CF7D34;">}</span></span><span style="color:#E9C062;"><span style="color:#E9C062;">[</span>a-zA-Z<span style="color:#E9C062;">]</span></span><span style="color:#CF7D34;"><span style="color:#CF7D34;">{</span>1<span style="color:#CF7D34;">}</span></span><span style="color:#CF7D34;">\d</span><span style="color:#CF7D34;"><span style="color:#CF7D34;">{</span>1<span style="color:#CF7D34;">}</span></span></span><span style="color:#E9C062;"><span style="color:#E9C062;">/</span></span>) <span style="color:#E28964;">?</span> <span style="color:#3387CC;">true</span> : <span style="color:#3387CC;">false</span> <span style="color:#E28964;">end</span> <span style="color:#E28964;">end</span> </pre> </div> </div> <a href="http://refactormycode.com/codes/118-is-this-string-postal" style="color:#fff" title="As seen on RefactorMyCode.com"><img alt="Small_logo" src="http://refactormycode.com/images/small_logo.gif" style="border:0" /></a>