Insert char to string to end of number

问题

I have ugly string:

oldstr = "0.100% fDrg: 2%,dgdv: 29% fGd dg 0.2%, Ghh-sf 2.2 dbgh: NONE dfgdf6 gd 3 "

I need to insert char | after the last digit of number for next splitting by this inserted |. There is also value none, where is also added this separator:

0.100| fdrg: 2|,dgdv: 29| fgd dg 0.2|, ghh-sf 2.2|dbgh: none| dfgdf6|gd 3|

I try this, but no success:

print re.sub(r'(\d+[a-z %^.])', r'\1|', oldstr.lower())

0.|100%| fdrg: 2%|,dgdv: 29%| fgd dg 0.|2%|, ghh-sf 2.|2 |dbgh: none dfgdf6 |gd 3 |

Any help will be appreciated.

回答1:

You can use

(\bnone\b|\d+(?:\.\d+)?)%?

And replace with \1|.

Explanation:

(\bnone\b|\d+(?:\.\d+)?) - Group 1 matching 2 alternatives:
- \bnone\b - whole word none
- | - or...
- \d+(?:\.\d+)? - a float value (\d+ matches one or more digits, and (?:\.\d+)? matches (optionally) a dot followed with one or more digits)
%? - an optional (since ? means match one or zero times) % symbol

See regex demo

Python code:

import re
p = re.compile(ur'(\bnone\b|\d+(?:\.\d+)?)%?', re.IGNORECASE)
test_str = "0.100% fDrg: 2%,dgdv: 29% fGd dg 0.2%, Ghh-sf 2.2 dbgh: NONE dfgdf6 gd 3 "
subst = "\1|"
result = re.sub(p, subst, test_str)

If you need to trim the values, you will be able to do it after splitting. Also, none can be turned lower case before processing the text with re.sub(r'\b\none\b', 'NONE', input).

回答2:

How about:

>>> re.sub(r"([\d\.]+|NONE)%?", r"\1|", oldstr)
'0.100| fDrg: 2|,dgdv: 29| fGd dg 0.2|, Ghh-sf 2.2| dbgh: NONE| dfgdf6| gd 3| '

Here we are capturing one or more occurences of digits and dots or a NONE in a capturing group (followed by an optional % sign) and replacing it with itself and a pipe character.

Note that @Wiktor's capturing part of the regular expression is much better than in this answer.

回答3:

import re
oldstr = "0.100% fDrg: 2%,dgdv: 29% fGd dg 0.2%, Ghh-sf 2.2 dbgh: NONE dfgdf6 gd 3"

newstring = re.sub(r"([\.\d]+)", r"\1|", oldstr)
print newstring.replace("%","").replace("NONE","NONE|")

output:

0.100| fDrg: 2|,dgdv: 29| fGd dg 0.2|, Ghh-sf 2.2| dbgh: NONE| dfgdf6| gd 3|

After a little more thinking here is a one-liner:

print re.sub(r"([\.\d'NONE']+)%?", r"\1|", oldstr)

来源：https://stackoverflow.com/questions/34857379/insert-char-to-string-to-end-of-number

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