re.fullmatch
The re.fullmatch function checks whether the entire text string satisfies the regular expression pattern, returning the corresponding match object. If the regular expression is not found, the function returns None.
re
re.match
The re.match function checks if the regular expression pattern is satisfied at the beginning of the text string, returning the corresponding match object if it is positive. In case of no match, the function returns None.
re.search
The re.search function traverses the string searching for the first match of the pattern, returning the corresponding match object. In case of no match found, the function returns None.
re.compile
The re.compile function creates a regular expression object by compiling a regular expression pattern, which can be used as a matching pattern in the re.match, re.search, etc. functions.
The use of this function makes sense mainly when we want to reuse a search pattern throughout our code, since the previous compilation of the search pattern makes the process more efficient. For example, we can start from the following code that performs a search for the same pattern in two different texts:
