Does "\d" in regex mean a digit?
encoding, gedit, python, regex
Solution
`[0-9]` is not always equivalent to `\d`. In python3, `[0-9]` matches only `0123456789` characters, while `\d` matches `[0-9]` and other digit characters, for example Eastern Arabic numerals `٠١٢٣٤٥٦٧٨٩`.
Problem
I found that in `123`, `\d` matches `1` and `3` but not `2`. I was wondering if `\d` matches a digit satisfying what kind of requirement? I am talking about Python style regex. Regular expression plugin in Gedit is using Python style regex. I created a text file with its content being ``` 123 ``` Only `1` and `3` are matched by the regex `\d`; `2` is not. Generally for a sequence of digit numbers without other characters in between, only the odd order digits are matches, and the even order digits are not. For example in `12345`, the matches are `1`, `3` and `5`.