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import java.util.*;
import java.util.regex.*;
 
class Main
{
  public static void main (String[] args) throws Exception
  {
    String[] test = { 
        "*date", "date*", "date", "date*date",            // valid strings
        "*date*", "date*date*", "*date*date", "date**"    // invalid strings
    };
    String[] rgxs = {
        "(?:[*]())?date(?:(?!\\1)[*](?:date)?|)",   // with pseudo-conditionals
        "\\*date|date(?:\\*(?:date)?)?"             // the old-fashioned way
    };
    for (String r : rgxs)
    {
      Pattern p = Pattern.compile(r);
      System.out.printf("%nregex : %s%n", p.pattern());
      for (String s : test)
      {
        System.out.printf("%-6b: %s%n", p.matcher(s).matches(), s);
      }
    }
  }
}

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• # 2:   hide show   clone   input   177 days 23 hours ago    Success

  result: Success     time: 0.03s    memory: 245632 kB     returned value: 0

  input:

  import java.util.*;
  import java.util.regex.*;
   
  class Main
  {
    public static void main (String[] args) throws Exception
    {
      String[] test = { 
          "*date", "date*", "date", "date*date",            // valid strings
          "*date*", "date*date*", "*date*date", "date**", "deva"    // invalid strings
      };
      String[] rgxs = {
          "(?:[*]())?date(?:(?!\\1)[*](?:date)?|)",   // with pseudo-conditionals
          "\\*date|date(?:\\*(?:date)?)?"             // the old-fashioned way
      };
      for (String r : rgxs)
      {
        Pattern p = Pattern.compile(r);
        System.out.printf("%nregex : %s%n", p.pattern());
        for (String s : test)
        {
          System.out.printf("%-6b: %s%n", p.matcher(s).matches(), s);
        }
      }
    }
  }

  output:

  regex : (?:[*]())?date(?:(?!\1)[*](?:date)?|)
  true  : *date
  true  : date*
  true  : date
  true  : date*date
  false : *date*
  false : date*date*
  false : *date*date
  false : date**
  
  regex : \*date|date(?:\*(?:date)?)?
  true  : *date
  true  : date*
  true  : date
  true  : date*date
  false : *date*
  false : date*date*
  false : *date*date
  false : date**
  
• # 1:   hide show   clone   input   560 days 19 hours ago    Success

  result: Success     time: 0.07s    memory: 213440 kB     returned value: 0

  input: no
  output:

  regex : (?:[*]())?date(?:(?!\1)[*](?:date)?|)
  true  : *date
  true  : date*
  true  : date
  true  : date*date
  false : *date*
  false : date*date*
  false : *date*date
  false : date**
  
  regex : \*date|date(?:\*(?:date)?)?
  true  : *date
  true  : date*
  true  : date
  true  : date*date
  false : *date*
  false : date*date*
  false : *date*date
  false : date**