“d"在正则表达式中是一个数字吗? [英] Does "d" in regex mean a digit?
问题描述
我发现在 123
中,d
匹配 1
和 3
但不匹配 2代码>.我想知道
d
是否匹配满足什么样的要求的数字?我说的是 Python 风格的正则表达式.
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.
Gedit 中的正则表达式插件使用 Python 风格的正则表达式.我创建了一个文本文件,其内容为
Regular expression plugin in Gedit is using Python style regex. I created a text file with its content being
123
只有1
和3
被正则表达式d
匹配;2
不是.
Only 1
and 3
are matched by the regex d
; 2
is not.
一般对于中间没有其他字符的数字序列,只有奇数位匹配,偶数位不匹配.例如在 12345
中,匹配的是 1
、3
和 5
.
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
.
推荐答案
[0-9]
并不总是等价于 d
.在python3中,[0-9]
只匹配0123456789
个字符,而d
匹配[0-9]
和其他数字字符,例如东方阿拉伯数字٠١٢٣٤٥٦٧٨٩
.
[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
.
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