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I've met a problem with re module in Python 3.6.5.
I have this pattern in my regular expression:
'\\nRevision: (\d+)\\n'
But when I run it, I'm getting a DeprecationWarning.
I searched for the problem on SO, and haven't found the answer, actually - what should I use instead of \d+? Just [0-9]+ or maybe something else?
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A string contains a literal character that is a reserved character in the Regex class (for example, the '(' or open parentheses character). Placing a '\' (backslash) in front of the character in the regular expression generates an 'Invalid escape sequence' compilation error.
To insert characters that are illegal in a string, use an escape character. An escape character is a backslash \ followed by the character you want to insert.
Any character (except for the newline character) will be matched by a period in a regular expression; when you literally want a period in a regular expression you need to precede it with a backslash. Many times you'll need to express the idea of the beginning or end of a line or word in a regular expression.
Python 3 interprets string literals as Unicode strings, and therefore your \d is treated as an escaped Unicode character.
Declare your RegEx pattern as a raw string instead by prepending r, as below:
r'\nRevision: (\d+)\n'
This also means you can drop the escapes for \n as well since these will just be parsed as newline characters by re.
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