expand on string manipulations

multiplication: 5 * "ha"
mention usage of regex (no need to tell much. Only that is can eb sued for searching in text. Refer to the doc: https://python.readthedocs.io/en/latest/library/re.html)
string formatting. For reference: https://realpython.com/python-string-formatting/
multiline strings with """
use parenthesis to break long string over multiple line (Reference: https://docs.python.org/3/reference/lexical_analysis.html#implicit-line-joining)
```
text = ( "my tooooooooooooo looooonnnng text"
  "for the purpose of the example")
```

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