正则表达式搜索从字符串中提取浮点数。蟒蛇 [英] Regex search to extract float from string. Python
问题描述
import re
sequence ='我手里有-0.03美元'
m = re.search('(have )( - \ w [。] +)(dollars\w +)',sequence)
print m.group(0)
print m.group(1)
打印m.group(2)
寻找一种在两次出现之间提取文本的方法。在这种情况下,格式是我有,其次是 - 浮动,然后是美元\ W +
如何使用re.search来提取此浮动?
为什么这些小组不以这种方式工作?我知道有一些事情可以调整,以便与这些团体合作。任何帮助将不胜感激
我以为我可以使用paranthesis组,但我得到了一个错误
-\w [。] +
不符合 -0.03
因为。
在$ 。
code> [...] 。
\w
after 美元
也阻止模式匹配序列
。在美元
之后没有单词字符。
使用( - ?\ d + \
$ pre $ code $> $ $ $ $ $ $ $ $ $ $ $ $ ='我手里有-0.03美元'
m = re.search(r'(have)( - ?\ d + \\d +)(dollars)',sequence)
print m.group(1)#从`1`开始捕获组。
print m.group(2)
print m.group(3)
顺便说一句,捕获的组号从 1
开始。 ( group(0)
返回整个匹配的字符串)
import re
sequence = 'i have -0.03 dollars in my hand'
m = re.search('(have )(-\w[.]+)( dollars\w+)',sequence)
print m.group(0)
print m.group(1)
print m.group(2)
Looking for a way to extract text between two occurrences. In this case, the format is 'i have ' followed by - floats and then followed by ' dollars\w+'
How do i use re.search to extract this float ? Why don't the groups work this way ? I know there's something I can tweak to get it to work with these groups. any help would be greatly appreciated
I thought I could use groups with paranthesis but i got an eror
-\w[.]+
does not match -0.03
because [.]
matches .
literally because .
is inside the [...]
.
\w
after dollars
also prevent the pattern to match the sequence
. There no word character after dollars
.
Use (-?\d+\.\d+)
as pattern:
import re
sequence = 'i have -0.03 dollars in my hand'
m = re.search(r'(have )(-?\d+\.\d+)( dollars)', sequence)
print m.group(1) # captured group start from `1`.
print m.group(2)
print m.group(3)
BTW, captured group numbers start from 1
. (group(0)
returns entire matched string)
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