title: Unable to remove the foreign languages unicode codes
body: <p>I have a .csvfile with multiple foreign languages(russian, japanese, arabic,etc) info within. For example, a column entry look like this:&lt;U+03BA&gt;&lt;U+03BF&gt;&lt;U+03C5&gt;.I want to remove rows which have this kind of info.
  I tried various solutions for, all of them with no result:</p>
  <pre><code>test_fb5 &lt;- read_csv('test_fb_data.csv', encoding = 'UTF-8')
  </code></pre>
  <p>or applied for a column:</p>
  <pre><code>gsub(&quot;[&lt;].*[&gt;]&quot;, &quot;&quot;)` or `sub(&quot;^\\s*&lt;U\\+\\w+&gt;\\s*&quot;, &quot;&quot;)
  </code></pre>
  <p>or</p>
  <pre><code>gsub(&quot;\\s*&lt;U\\+\\w+&gt;$&quot;, &quot;&quot;)
  </code></pre>
  <p>It seems that R 4.1.0 doesn't find the respective chars. I cannot find a way to attach a small chunk of file here.
  Here is the capture of the file:</p>
  <pre><code>                        address
  33085                                           9848a 33 avenue nw t6n 1c6 edmonton ab canada alberta
  33086                                 1075 avenue laframboise j2s 4w7 sainthyacinthe qc canada quebec
  33087 &lt;U+03BA&gt;&lt;U+03BF&gt;&lt;U+03C5&gt;&lt;U+03BD&gt;&lt;U+03BF&gt;&lt;U+03C5&gt;p&lt;U+03B9&gt;tsa 18050 spétses greece attica region
  33088                                       390 progress ave unit 2 m1p 2z6 toronto on canada ontario
                                                       name
  33085                                md legals canada inc
  33086                             les aspirateurs jpg inc
  33087 p&lt;U+03AC&gt;t&lt;U+03C1&gt;a&lt;U+03BB&gt;&lt;U+03B7&gt;&lt;U+03C2&gt;patralis
  33088                    wrench it up plumbing mechanical
                                                                 category
  33085 general practice attorneys divorce  family law attorneys notaries
  33086                                                              &lt;NA&gt;
  33087               mediterranean restaurants fish  seafood restaurants
  33088            plumbing services damage restoration  mold remediation
               phone
  33085  17808512828
  33086  14507781003
  33087 302298072134
  33088  14168005050
  </code></pre>
  <p>the 3308's are the rows of the dataset
  Thank you for your time!</p>