python - how to apply a specific regex to a specific line -


i trying apply specific regex on specific line, specified starting key: right have content of file inside python variable my_config

file content --------------------------------------------- [paths] path_jamjs: c:/users/[changeusername]/appdata/roaming/npm/node_modules/jamjs/bin/jam.js path_php: c:/[changeusername]/php/php.exe  values replace --------------------------------------------- "path_jamjs": { "changeusername": "te" }, "path_php": { "changeusername": "tes" }, 
with open ("my.ini", "r") myfile:   my_config = myfile.read()

how can apply regex replace on entire file content in my_config replace value @ specific corresponding line, without having loop line line, can regex?

given

path: path_php key: changeusername value: te

change

path_jamjs: c:/users/[changeusername]/appdata/roaming/npm/node_modules/jamjs/bin/jam.js path_php: c:/[changeusername]/php/php.exe

to

path_jamjs: c:/users/[changeusername]/appdata/roaming/npm/node_modules/jamjs/bin/jam.js path_php: c:/te/php/php.exe 

with open ("my.ini", "r") myfile:     my_config = myfile.read()  lines = my_config.splitlines(true) replacements = {"path_jamjs": {"changeusername": "te"},                 "path_php": {"changeusername": "tes"}}  path, reps in replacements.items():     i, line in enumerate(lines):         if line.startswith(path + ':'):             key, value in reps.items():                 line = line.replace('[' + key + ']', value)             lines[i] = line  result = ''.join(lines)

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