1. Regular Expressions for Text Processing:

• Regular expressions (regex or regexp) are a powerful tool for pattern matching and text processing.
• The re module in Python is used for working with regular expressions.
• Common metacharacters: . (any character), * (zero or more), + (one or more), ? (zero or one), [] (character class), | (OR), ^ (start of a line), $ (end of a line), etc.
• Examples of regex usage: matching emails, phone numbers, or extracting data from text.
• re module functions include re.match(), re.search(), re.findall(), and re.sub() for pattern matching and replacement.