On 04/01/2011 17:11, Jeremy wrote:
I am trying to write a regular expression that finds and deletes (replaces with
nothing) comments in a string/file. Comments are defined by the first
non-whitespace character is a 'c' or a dollar sign somewhere in the line. I
want to replace these comments with nothing which isn't too hard. The trouble
is, the comments are replaced with a new-line; or the new-line isn't captured
in the regular expression.
Below, I have copied a minimal example. Can someone help?
Thanks,
Jeremy
import re
text = """ c
C - Second full line comment (first comment had no text)
c Third full line comment
F44:N 2 $ Inline comments start with dollar sign and go to end of line"""
commentPattern = re.compile("""
(^\s*?c\s*?.*?| # Comment start with c or C
\$.*?)$\n # Comment starting with $
""", re.VERBOSE|re.MULTILINE|re.IGNORECASE)
Part of the problem is that you're not using raw string literals or
doubling the backslashes.
Try soemthing like this:
commentPattern = re.compile(r"""
(^[ \t]*c.*\n| # Comment start with c or C
[ \t]*\$.*) # Comment starting with $
""", re.VERBOSE|re.MULTILINE|re.IGNORECASE)
found = commentPattern.finditer(text)
print("\n\nCard:\n--------------\n%s\n------------------" %text)
if found:
print("\nI found the following:")
for f in found: print(f.groups())
else:
print("\nNot Found")
print("\n\nComments replaced with ''")
replaced = commentPattern.sub('', text)
print("--------------\n%s\n------------------" %replaced)
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