title: Query Chinese characters(utf-8) in Google Big Query
body: <p>I want to query out titles which contains Chinese characters(ex:數學) from my google dataset, and I hava tried many methods as follows.</p>
  
  <p>Google big query only has LENGTH() function,and it doesn't hava DATALENGTH() to compare the difference of length and datasize.</p>
  
  <p>Then, I try to use REGEXP_MATCH() '[\u4e00-\u9fa5]' to match Chinese characters, but it doesn't work, too. </p>
  
  <p>I can't figure out if there are other methods to solve this problem.
  Please help, thank you.</p>