使用通配符搜索和替换文本文件中的字符串

Question

Trying to do a search/replace in python using wildcards on the contents of a text file:

If the contents of the text file looks like:

"all_bcar_v0038.ma";
"all_bcar_v0002.ma";
"all_bcar_v0011.ma";
"all_bcar_v0011.ma";

Looking to replace all the version numbers with v1000 to get this:

"all_bcar_v1000.ma";
"all_bcar_v1000.ma";
"all_bcar_v1000.ma";
"all_bcar_v1000.ma";

And have the file written out.

I've tried the below but what happens is the script only catches the first version number, leaving the others untouched:

def replaceAll(file,searchExp,replaceExp):
for line in fileinput.input(file, inplace=1):
    if searchExp in line:
    line = line.replace(searchExp,replaceExp)
    sys.stdout.write(line)

rigs = ['all_bcar']
rigs_latest = ['all_bcar_v1000']

old_pattern = []
old_compiled = []
old = []
old_version = []

for rig in range(len(rigs)):
    old_pattern.append("/" + rigs[rig] + "_(.*).ma")
    fin = open(txt_file, "r")

    old_compiled.append(re.compile(old_pattern[rig]))
    old.append(old_compiled[rig].search(fin.read()))
    old_version.append(old[rig].group(1).strip())
    old_rig = (rigs[rig] + "_" + old_version[rig])
    replaceAll(txt_file,old_rig,rigs_latest[rig])


fin.close()

Not sure how to keep the search looping to find other versions and to avoid the versions that have already been replaced, to skip any versions that equal "v1000".

Answer 1

Your life would be vastly improved with the use of regexes . You should be able to do this in 2 lines (assuming I understand the problem correctly):

import re

for line in fileinput.input(file, inplace=1):
  re.sub(r"_v\d{4}", "_v1000", line)

Answer 2

Try -

import re

re.sub("_v\d{4}", "_v1000.", string)