#[Dyalog APL](http://goo.gl/9KrKoM), <s>19</s> 17 [bytes](http://meta.codegolf.stackexchange.com/a/9429/43319)
    ≢+(⍎'\d'⎕R'&+',⊢)

Takes string and returns

&emsp;`≢` length<br>
`+` plus<br>
&emsp;`⍎` the evaluation of<br>
&emsp;&emsp;&emsp;`'\d'⎕R'&+'` regex append digits with a plus<br>
&emsp;&emsp;`,` followed by<br>
&emsp;&emsp;&emsp;`⊢` the unmodified string

–2 thanks to ngn