String contains vs contains ignore case

output

Generating data: 1000
Equals... 0 - 1ms
Contains... 100 - 1ms
Standard contains ignore case... 133 - 5ms
Apache commons contains ignore case... 133 - 13ms
---
Generating data: 10000
Equals... 0 - 1ms
Contains... 1000 - 2ms
Standard contains ignore case... 1333 - 5ms
Apache commons contains ignore case... 1333 - 7ms
---
Generating data: 100000
Equals... 0 - 7ms
Contains... 10000 - 10ms
Standard contains ignore case... 13333 - 53ms
Apache commons contains ignore case... 13333 - 67ms
---
Generating data: 1000000
Equals... 0 - 12ms
Contains... 100000 - 27ms
Standard contains ignore case... 133333 - 726ms
Apache commons contains ignore case... 133333 - 704ms
---
Generating data: 10000000
Equals... 0 - 107ms
Contains... 1000000 - 292ms
Standard contains ignore case... 1333333 - 7791ms
Apache commons contains ignore case... 1333333 - 6283ms
---

StringSearchBench.java

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang.RandomStringUtils;
import org.apache.commons.lang.StringUtils;

public class StringSearchBench {

  private static final String STR = "from C_Order";

  public static void main(String[] args) {
    test(1_000);
    test(10_000);
    test(100_000);
    test(1_000_000);
    test(10_000_000);
  }

  private static void test(int loops) {
    System.out.println("Generating data: " + loops);
    List<String> queries = new ArrayList<>(loops);
    for (int i = 0; i < loops; i++) {
      String query = RandomStringUtils.randomAlphanumeric(50);
      if (i % 10 == 0) {
        query += STR;
      } else if (i % 15 == 0) {
        query += STR.toUpperCase();
      }
      queries.add(query);
    }

    {
      System.out.print("Equals... ");
      int matches = 0;
      long t = System.currentTimeMillis();
      for (String query : queries) {
        if (query.equals(STR)) {
          matches++;
        }
      }
      System.out.println(matches + " - " + (System.currentTimeMillis() - t) + "ms");
    }

    {
      System.out.print("Contains... ");
      int matches = 0;
      long t = System.currentTimeMillis();
      for (String query : queries) {
        if (query.contains(STR)) {
          matches++;
        }
      }
      System.out.println(matches + " - " + (System.currentTimeMillis() - t) + "ms");
    }

    {
      System.out.print("Standard contains ignore case... ");
      int matches = 0;
      long t = System.currentTimeMillis();
      String upperStr = STR.toUpperCase();
      for (String query : queries) {
        if (query.toUpperCase().contains(upperStr)) {
          matches++;
        }
      }
      System.out.println(matches + " - " + (System.currentTimeMillis() - t) + "ms");
    }

    {
      System.out.print("Apache commons contains ignore case... ");
      int matches = 0;
      long t = System.currentTimeMillis();
      for (String query : queries) {
        if (StringUtils.containsIgnoreCase(query, STR)) {
          matches++;
        }
      }
      System.out.println(matches + " - " + (System.currentTimeMillis() - t) + "ms");
    }
    System.out.println("---");
  }
}