I am trying to match a regex pattern across multiple lines. The pattern begins and ends with a substring, both of which must be at the beginning of a line. I can match across lines, but I can't seem to specify that the end pattern must also be at the beginning of a line.
Example string:
Example=N ; Comment Line One error=
; Comment Line Two.
Desired=
I am trying to match from Example=
up to Desired=
. This will work if error=
is not in the string. However, when it is present I match Example=N ; Comment Line One error=
Example=N ; Comment Line One error=
config_value = 'Example'
pattern = '^{}=(.*?)([A-Za-z]=)'.format(config_value)
match = re.search(pattern, string, re.M | re.DOTALL)
I also tried:
config_value = 'Example'
pattern = '^{}=(.*?)(^[A-Za-z]=)'.format(config_value)
match = re.search(pattern, string, re.M | re.DOTALL)
You may use
config_value = 'Example'
pattern=r'(?sm)^{}=(.*?)(?=[\r\n]+\w+=|\Z)'.format(config_value)
match = re.search(pattern, s)
if match:
print(match.group(1))
See the Python demo .
Pattern details
(?sm)
- re.DOTALL
and re.M
are on ^
- start of a line Example=
- a substring (.*?)
- Group 1: any 0+ chars, as few as possible (?=[\\r\\n]+\\w+=|\\Z)
- a positive lookahead that requires the presence of 1+ CR or LF symbols followed with 1 or more word chars followed with a =
sign, or end of the string ( \\Z
). See the regex demo .
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