code: def CommaSeparatedTokenizer():
      """Splits tokens by commas.
  
      Note that the tokenizer calls unicode.strip() on each match of the regular
      expression.
  
      >>> cst = CommaSeparatedTokenizer()
      >>> [token.text for token in cst("hi there, what's , up")]
      ["hi there", "what's", "up"]
      """
  
      from whoosh.analysis.filters import StripFilter
  
      return RegexTokenizer(r"[^,]+") | StripFilter()
  
imports: from whoosh.compat import u, text_type
  from whoosh.analysis.acore import Composable, Token
  from whoosh.util.text import rcompile
label_desc: Use image node_id 2 for calling a global function with example usage: CommaSeparatedTokenizer() and returns: unknown