python re.sub group: number after number
How can I replace foobar with foo123bar?
regex
How to check for valid email address?
All we are really doing is comparing the input string to one
gigantic regular expression. But building that regexp, and
ensuring its correctness, is made much easier by assembling it
from the “tokens” defined by the RFC. Each of these tokens is
tested in the accompanying unit test file.
Python re.sub with a flag does not replace all occurrences
The Python docs say:
Checking whole string with a regex
I’m trying to check if a string is a number, so the regex “d+” seemed good. However that regex also fits “78.46.92.168:8000” for some reason, which I do not want, a little bit of code:
What exactly is a “raw string regex” and how can you use it?
From the python documentation on regex, regarding the '' character:
Python non-greedy regexes
How do I make a python regex like "(.*)" such that, given "a (b) c (d) e" python matches "b" instead of "b) c (d"?
Split a string by spaces — preserving quoted substrings — in Python
I have a string which is like this:
Python regex matching Unicode properties
Perl and some other current regex engines support Unicode properties, such as the category, in a regex. E.g. in Perl you can use p{Ll} to match an arbitrary lower-case letter, or p{Zs} for any space separator. I don’t see support for this in either the 2.x nor 3.x lines of Python (with due regrets). Is anybody aware of a good strategy to get a similar effect? Homegrown solutions are welcome.
Find shortest matches between two strings
I have a large log file, and I want to extract a multi-line string between two strings: start and end.
Confused about backslashes in regular expressions
Perhaps the most important metacharacter is the backslash, . As in Python string literals, the backslash can be followed by various characters to signal various special sequences. It’s also used to escape all the metacharacters so you can still match them in patterns; for example, if you need to match a [ or , you can precede them with a backslash to remove their special meaning: [ or \.