Remove leading zeros from a string using regex

I am learning regex and java and working on a problem related to that.

I have an input string which can be any dollar amount like

$123,456.78
$0012,345.67
$123,04.56
$123,45.06

it also could be

$0.1

I am trying to find if the dollar amount has leading zeros and trying to remove it.

so far I have tried this

string result = input_string.replaceAll(("[!^0]+)" , "");

But I guess I’m doing something wrong.
I just want to remove the leading zeros, not the ones between the amount part and not the one in cents. And if the amount is $0.1, I don’t want to remove it.

>Solution :

Match zeroes or commas that are preceded by a dollar sign and followed by a digit:

str = str.replaceAll("(?<=\\$)[0,]+(?=\\d)", "");

See live demo.

This covers the edge cases:

• $001.23 -> $1.23
• $000.12 -> $0.12
• $00,123.45 -> $123.45
• $0,000,000.12 -> $0.12

The regex:

• (?<=\\$) means the preceding character is a dollar sign
• (?=\\d) means the following character is a digit
• [0,]+ means one or more zeroes or commas