Python正则表达式:如何将数字与非数字匹配？

Question

我希望拆分号码与另一个角色.

例

输入:

we spend 100year

输出:

we speed 100 year

输入:

today i'm200 pound

产量

today i'm 200 pound

输入:

he maybe have212cm

输出:

he maybe have 212 cm

我试过re.sub(r'(?<=\S)\d', ' \d', string)和re.sub(r'\d(?=\S)', '\d ', string),这是行不通的.

Answer 1

这样做:

ins='''\
we spend 100year
today i'm200 pound
he maybe have212cm'''

for line in ins.splitlines():
    line=re.sub(r'\s*(\d+)\s*',r' \1 ', line)
    print line

打印:

we spend 100 year
today i'm 200 pound
he maybe have 212 cm

同一行文本中多个匹配的语法相同:

>>> re.sub(r'\s*(\d+)\s*',r' \1 ', "we spend 100year + today i'm200 pound")
"we spend 100 year + today i'm 200 pound"

捕获组(通常)从左到右编号,并且\number指的是匹配中的每个编号组:

>>> re.sub(r'(\d)(\d)(\d)',r'\2\3\1','567')
'675'

如果它更容易阅读,您可以命名您的捕获组而不是使用\1 \2表示法:

>>> line="we spend 100year today i'm200 pound"
>>> re.sub(r'\s*(?P<nums>\d+)\s*',r' \g<nums> ',line)
"we spend 100 year today i'm 200 pound"