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Assume I have created a compiled re:
x = re.compile('^\d+$') Is there a way to extract the pattern string (^\d+$) back from the x?
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compile() method is used to compile a regular expression pattern provided as a string into a regex pattern object ( re. Pattern ). Later we can use this pattern object to search for a match inside different target strings using regex methods such as a re. match() or re.search() .
The re. compile() method We can combine a regular expression pattern into pattern objects, which can be used for pattern matching. It also helps to search a pattern again without rewriting it.
compile() and saving the resulting regular expression object for reuse is more efficient when the expression will be used several times in a single program. So my conclusion is, if you are going to match the same pattern for many different texts, you better precompile it.
There is a difference between the use of both functions. Both return the first match of a substring found in the string, but re. match() searches only from the beginning of the string and return match object if found. But if a match of substring is found somewhere in the middle of the string, it returns none.
You can get it back with
x.pattern from the Python documentation on Regular Expression Objects
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