What is the syntax of regular expressions in Python?

The syntax of Python regular expressions mainly includes the following metacharacters and modifiers:

1. Meta character:

1. Match any character.
2. ^: Matches the beginning of a string.
3. $: Matches the end of a string.
4. *: Match the preceding character zero or more times.
5. + : matches the preceding character one or more times.
6. Match the preceding character zero or one time.
7. {}: specifies the number of repetitions of the preceding character.
8. []: Match any character inside the square brackets.
9. The vertical bar | is used to indicate an “or” relationship, matching either the character before or after it.
10. ( ): grouping, used to extract matching substrings.

1. Modifier (optional):

1. Match regardless of case.
2. re.M: Enables multi-line matching, affecting the behavior of ^ and $.
3. re.S: Enable the matching of all characters, including newline characters.
4. Ignore whitespace characters in the regular expression, multi-line mode can be used.

The re module can be used to compile regular expressions using the re.compile() function, and then matching operations can be performed using functions such as match(), search(), and findall().