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In my file containing latex source code, I wish to comment out all the lines matching a pattern (specifically, the pattern that I am interested in is \draw, including the \ character).

I have magic mode enabled.I think a potential solution would be to use the global command i.e. something along the lines of

:g/\\draw/command

I am unsure of the command that achieves my task. I would like to seek your help through either of the methods below:

a) I have Tim Pope's commentary plugin which provides the gc mapping, that works in normal mode. However, this does not work here.

b) Maybe use the normal mode I command and use the comment character for latex, i.e. the % character on those lines matched by the global command

If a simpler alternative(s) exist in addition to the ones mentioned above, I am of course glad to learn about it too!

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You can use g/\\draw/s/^/%/ to insert a percent sign at the start of every line containing the text \draw. s/^/%/ means replace the empty string at the start of the line with a percent sign.

If you want to put the percent sign after any leading white space---which is more similar to how the normal command I works---, use g/\\draw/s/^\s*/&%/ instead. s/^\s*/&%/ means replace a possibly empty string of whitespace characters at the start of the line with the string itself, followed by a percent sign.

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Try using :g/\\draw/norm gc

From :help norm:

Execute Normal mode commands {commands}. This makes it possible to execute Normal mode commands typed on the command-line. {commands} are executed like they are typed.

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