decrease number?

[stosss]

I have several hundred lines like the one below:

<line x1="20"  y1="45"  x2="820" y2="45"  stroke-width="1" stroke="#c0c0c0" />

I want to change them like this:

<line x1="10"  y1="35"  x2="810" y2="35"  stroke-width="1" stroke="#c0c0c0" />

The "ten" place holder needs to decrease by one.
x1="20" y1="45" x2="820" y2="45"

Can someone point me to something that would show me a fast way to do this?

I am thinking some how I should be able to use CTRL-X in a search and replace but I don't know how to do it. I am guessing '\=' would be used. I really don't know how to put this together.

Thanks

[stosss]

Placing cursor on the number and typing 10CTRL-X reduces it by the desired amount but how do I do it in a search and replace pattern?

[John Passaro]

use the expression register:

s/\v\w+\="\zs\d\d+\ze"/\=submatch(0)-10/g

John Passaro
(917) 678-8293

http://riemann-summary.blogspot.com

http://www.soundcloud.com/a-straight-john-at-last

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[stosss]

Thank You John! Awesome!

[Tim Chase]

I'd go with your "\=" suggestion. Something like

:%s/\<[xy][12]="\zs[^"]*\ze"/\=submatch(0)-10/g

This only finds x1, x2, y1, and y2. You can relax the pattern a bit
if there are other variable-names in question.

-tim

[Tim Chase]

On 2017-06-19 22:29, John Passaro wrote:
> use the expression register:
>
> s/\v\w+\="\zs\d\d+\ze"/\=submatch(0)-10/g

Beware that this catches any variable name (not just [xy][12] which
may or may not be what you want), and also doesn't catch
negative-number values.

But for the general case of the example you (OP) gave, John's works
well too.

-tim

[stosss]

Thanks Tim,

Johns did work exactly the way I wanted it to.

I like yours too.