javascript - Replace all specific characters with counter ascending? -

i have string this:

var str = "some text here             - first case             - second case              - third case            text here"; 

now need output:

var newstr = "some text here                 1. first case                 2. second case                  3. third case                text here"; 

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all can removing -. need replace $1 dynamic number... possible?

something this:

.replace (/(^\s*-\s+)/gm, "{a dynamic number ascending}. ") 

you can use string#replace callback , counter.

using es2015 arrow function:

str.replace(/^\s*- /gm, () => counter++ + '. '); 

var str = `some text here                  - first case                  - second case                   - third case                 text here`;    var counter = 1;  str = str.replace(/^\s*- /gm, () => counter++ + '. ');    console.log(str);  document.write(str); // demo purpose

equivalent code in es5

str.replace(/^\s*- /gm, function() {     return counter++ + '. '; }); 

the regex /^\s*- /gm, match lines starting number of spaces followed hyphen.

var str = `some text here              - first case              - second case               - third case             text here`;    var counter = 1; // initialize counter    str = str.replace(/^\s*- /gm, function() {    return counter++ + '. '; // incrementing counter after using value  });    console.log(str);  document.write(str); // demo purpose