code: public BooleanExpression containsIgnoreCase(Expression<String> str) {
          return Expressions.booleanOperation(Ops.STRING_CONTAINS_IC, mixin, str);
      }
docs: Create a {@code this.containsIgnoreCase(str)} expression
  
  <p>Returns true if the given String is contained, compare case insensitively</p>
  
  @param str string
  @return this.containsIgnoreCase(str) expression