Input field value - remove leading zeros

Question

I have a textbox in Javascript. When I enter \'0000.00\' in the textbox, I want to know how to convert that to only having one leading zero, such as \'0.0

Answer 1

You can use a regex to replace the leading zeroes with a single one:

valueString.replace(/^(-)?0+(0\.|\d)/, '$1$2')

>'-000.0050'.replace(/^(-)?0+(0\.|\d)/, '$1$2')
< "-0.0050"
>'-0010050'.replace(/^(-)?0+(0\.|\d)/, '$1$2')
< "-10050"

Matches:

Replaces with:

• ^ is the beginning of text

• ? means optional (refers to the previous character)

• (a|b) means either a or b

• . is the dot (escaped as . has a special meaning)

• \d is any digit

• $1 means what you found in the first set of ()

• $2 means what you found in the second set of ()