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  <author_name>iww</author_name>
  <author_url>https://blog.hatena.ne.jp/iww/</author_url>
  <blog_title>揮発性のメモ２</blog_title>
  <blog_url>https://iww.hateblo.jp/</blog_url>
  <categories>
    <anon>JavaScript</anon>
  </categories>
  <description>10e11 とか 0x10 とかは数字として断じて認めない function isnum(str) { return str.match(/^[-]?[\d]+\.?[\d]*$/); } var a = &quot;-5.00a&quot;; console.log( isnum(a) ? &quot;数値だ&quot; : &quot;数値じゃない&quot; );</description>
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  <provider_name>Hatena Blog</provider_name>
  <provider_url>https://hatena.blog</provider_url>
  <published>2017-03-18 00:00:00</published>
  <title> 数字かそうじゃないか判定</title>
  <type>rich</type>
  <url>https://iww.hateblo.jp/entry/20170318/isnum</url>
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