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Same problem.
For some reason,

sed 's/^[pP][rR][iI][nN][tT]/#print/' <filename>

is not commenting when the ‘print' statement starts with a tab/space (See the second encircled code.)

Can...

For some reason the above code does not seem to work.

This is my code:

<--START

a = "This is a print statement
print a
b = "This contains print statement"
print b
...

How do I replace only if the keyword is at the begining of a line?
Code:
--
a = “This is a print statement”
print a
--
What if I want to replace print by #print only in the second line i.e...

How do I replace only if the keyword is at the begining of a line?
Code:
--
a = “This is a print statement”
print a
--
What if I want to replace print by #print only in the second line i.e...