Hi. I have a circumstance where I have to search and replace a block
of text in a very large file. I have written some psuedo code to
locate the text and print the span of text to be removed and replaced
by new block. Can someone advise what to do to remove the text span
and insert with the new text. the match.span() provides a tuple of the
starting and ending position. Many thanks.
Regards,
David
import mmap
import re
text_to_insert = 'the block to insert'
pattern = re.compile(my regex here)
f = open('my_large_file.dat', 'r+')
try:
m = mmap.mmap(f.fileno(), 0)
try:
match = chart_re.search(m)
print match.span()
finally:
m.close()
finally:
f.close()
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