Javascript-正则表达式-用不同的字符串替换字符串中的所有其他匹配项

Question

So I have my code like this:

for (var i = 0; i < str.length; i++) {
    str = str.replace("|", "Math.abs(");
    str = str.replace("|", ")");
}

Is there anyway to get the same effect using a regex?

Or at least a regex with a function?:

str = str.replace(/?/g, function() {?});

Answer 1

You can use this single regex replace method:

str = str.replace(/\|([^|]+)\|/g, 'Math.abs($1)');

RegEx Demo

Answer 2

You can match the string between | s and then replace them with whatever string you want

str[i] = str[i].replace(/\|(.*?)\|/g, "Math.abs($1)");

For example,

var str = ["|1|", "|-2|+|22 * -3|"];
for (var i = 0; i < str.length; i++) {
    str[i] = str[i].replace(/\|(.*?)\|/g, "Math.abs($1)");
}
console.log(str);
# [ 'Math.abs(1)', 'Math.abs(-2)+Math.abs(22 * -3)' ]