| 28 | Find the Index of the First Occurrence in a String | Medium |
| 214 | Shortest Palindrome | Hard |
| 459 | Repeated Substring Pattern | Easy |
| 572 | Subtree of Another Tree | Easy |
| 686 | Repeated String Match | Medium |
| 796 | Rotate String | Easy |
| 1023 | Camelcase Matching | Medium |
| 1392 | Longest Happy Prefix | Hard |
| 1397 | Find All Good Strings | Hard |
| 1408 | String Matching in an Array | Easy |
| 1455 | Check If a Word Occurs As a Prefix of Any Word in a Sentence | Easy |
| 1668 | Maximum Repeating Substring | Easy |
| 1764 | Form Array by Concatenating Subarrays of Another Array | Medium |
| 2223 | Sum of Scores of Built Strings | Hard |
| 2301 | Match Substring After Replacement | Hard |