JavaScript replace empty comma with zero

Question

This is the code I'm using to try to replace empty commas with zero:

let str = '<C><P /><Z><S><S P=",,0.3,0.2,,,," L="195" X="256" H="32" Y="306" T="0" /><S P=",,0.3,0.2,,,," L="146" X="587" H="87" Y="257" T="0" /><S P=",,0.3,0.2,,,," L="50" X="333" H="45" Y="82" T="0" /></S><D /><O /></Z></C>';
let repl = str.replace(/,,/g, ",0,");

The result is:

<C><P /><Z><S><S P=",0,0.3,0.2,0,,0," L="195" X="256" H="32" Y="306" T="0" /><S P=",0,0.3,0.2,0,,0," L="146" X="587" H="87" Y="257" T="0" /><S P=",0,0.3,0.2,0,,0," L="50" X="333" H="45" Y="82" T="0" /></S><D /><O /></Z></C>

I expected something like: <... P="0,0,0.3,0.2,0,0,0,0" .../>

How to do it?

You are replacing two comma with a zero with comma before and after it. That's what you got there. Can you explain why did you expect something else? — Mat J
– Mat J, Commented Jun 30, 2020 at 6:35

Marek Puchalski · Accepted Answer · 2020-06-30 06:40:26Z

3

How about:

repl = repl.replace(/P=",/g, 'P="0,')
repl = repl.replace(/,"/g, ',0"')

answered Jun 30, 2020 at 6:40

Marek Puchalski

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Comments

Bala · Accepted Answer · 2020-06-30 07:10:13Z

Although accepted answer does the job, following is a bit generic than that.

let str = '<C><P /><Z><S><S P=",,0.3,0.2,,,," L="195" X="256" H="32" Y="306" T="0" /><S P=",,0.3,0.2,,,," L="146" X="587" H="87" Y="257" T="0" /><S P=",,0.3,0.2,,,," L="50" X="333" H="45" Y="82" T="0" /></S><D /><O /></Z></C>';

let str = str.replace(/,+/g, ',').replace(/",|,"/g,'"')

Explanation:

Replace one or more occurrences of comma with comma

str.replace(/,+/g, ',')
Now there will not be any duplicates but words within quites will have trailing commas which can be removed using following

str.replace(/",|,"/g,'"')

Demo:

 let str = '<C><P /><Z><S><S P=",,0.3,0.2,,,," L="195" X="256" H="32" Y="306" T="0" /><S P=",,0.3,0.2,,,," L="146" X="587" H="87" Y="257" T="0" /><S P=",,0.3,0.2,,,," L="50" X="333" H="45" Y="82" T="0" /></S><D /><O /></Z></C>';

 let output =  str.replace(/,+/g, ',').replace(/",|,"/g,'"')
 
 console.log("input:", str);
 console.log("output:",output);

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