使用正则表达式将字符替换为特定字符

Question

I have a string "000-2.50" or "00-12.50" or "0-120.50" and I want to replace the zeros up to the minus sign "-" with an @ char.

I want to end up with "@@@-2.50" or "@@-12.50" or "@-120.50". How do I achieve that using Regex?

Answer 1

Look for all zeros that are followed by a dash using a positive lookahead:

Method 1:

0(?=[^-]*-)

JS Code:

 console.log( "000-2.50".replace(/0(?=[^-]*-)/g, "@") ); 

Method 2

Or if you only want leading zeros:

 console.log( "000-2.50".replace(/^0+(?=-)/g, function(match) { return "@".repeat(match.length); }) ) 

Answer 2

To replace each 0 from beginning of the string, how about using the sticky flag y

 var str = '000-2.50'; var res = str.replace(/0/gy, '@'); console.log(res);