```python
import re

txt = "Python"

#Return a match at every white-space character in txt:

x = re.findall("\s", txt)

print(x)

if x:
  print("Match!")
else:
  print("No match")

#Since txt has no white-space characters, it will print "No match"
```

University of Michigan - Ann Arbor

- \w matches any alphanumeric character, so a-z, A-Z, 0-9 and _.
- \W matches non-alphanumeric characters.
- \d matches digits (0-9).
- \D matches any non-digits.
- \s matches whitespace characters, including newlines, tabs, or spaces.
- \S matches non-whitespace characters.
- \n matches newline characters.
- \t matches tab characters.

Character Classes

```python
import re

txt = "1Cademy rocks!"

#Check if txt contains any digits (numbers from 0-9):

x = re.findall("\d", txt)

print(x)

if x:
  print("Match!")
else:
  print("No match")

#Since txt contains "1", it will print "Match!"
```

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