| Collect Unicode Graphemes |  |  |
| Verify and extract login from an email address |   |  |
| Extract a list of unique #Hashtags from a text | | |
| Extract phone numbers from text | | |
| Filter a log file by matching multiple regular expressions | | |
| Replace all occurrences of one text pattern with another pattern. | | |
Implement the FromStr trait for a custom struct |  | |