Python regex match a complete guide to re match

### syntax:

### parameters:
- `pattern`: the regular expression pattern to be matched.
- `string`: the input string to search for the pattern.
- `flags`: optional flags to modify the behavior of the regex matching.

### return value:
- returns a match object if the pattern is found at the beginning of the string, otherwise returns `none`.

### example 1: matching a simple pattern

### example 2: using groups in the pattern
python
import re

pattern = r'hello'
string = 'hello, world!'

if match:
print('pattern found at the beginning of the string')
else:
print('pattern not found')

# output: pattern found at the beginning of the string
```

### summary:
- use groups in the pattern to extract specific parts of the matched string.
- flags can be used to modify the behavior of the regex matching, such as ignoring case.

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