Python re.sub() Method: Find and Replace with Regular Expressions

re.sub() is a method in the re module in Python that is used to perform find and replace operations on strings using regular expressions.\n\nThe syntax for re.sub() is as follows:\n\npython\nre.sub(pattern, repl, string, count=0, flags=0)\n\n\n- pattern: The regular expression pattern to be searched for.\n- repl: The replacement string or function.\n- string: The input string where the pattern is to be searched and replaced.\n- count (optional): The maximum number of replacements to be made. If not specified, all occurrences will be replaced.\n- flags (optional): Additional flags to modify the matching behavior. Common flags include re.IGNORECASE, re.MULTILINE, etc.\n\nThe re.sub() method returns a new string where all occurrences of the pattern in the input string have been replaced with the specified replacement string or the value returned by the replacement function.\n\nHere's an example usage of re.sub():\n\npython\nimport re\n\ntext = "Hello, world!"\nnew_text = re.sub(r"world", "Python", text)\nprint(new_text) # Output: Hello, Python!\n\n\nIn this example, the string "world" in the text variable is replaced with "Python" using re.sub().