import re

f = open("pubspec.json")
print(f)
txt = f.read().replace('\n', '')
print(txt)
print()

mg = re.search(r'versionCode[:"\s]+(\d+)', txt)
print(mg.group(1))

ng = re.search(r'versionName[:"\s]+([\d.]+)', txt)
print(ng.group(1))