How do I search and replace a pattern in text usin

问题:

How do I search and replace a pattern in text using regular expression in Python 3 ?

import re
text = "|105_Oldtext1.1|309_Oldtext1.1|367_Newtext1.6|413_Newtext1.6|"
result = re.sub("105_*", "105_Newtext1.6", text)
print(result)

what I get as result is:

"|105_Newtext1.6Oldtext1.1|309_Oldtext1.1|367_Newtext1.6|413_Newtext1.6|"

I want to replace 105_(whatever text) by 105_Newtext1.6

回答1:

The * isn't a wildcard here ;) You might need this instead:

import re
text = "|105_Oldtext1.1|309_Oldtext1.1|367_Newtext1.6|413_Newtext1.6|"
result = re.sub("105_[^|]*", "105_Newtext1.6", text)
print(result)

* means that the previous character is repeated 0 or more times. So, [^|]* means any character which is not a pipe character being repeated 0 or more times.