How do i write a regex for capturing decimal numbers?

Question

I need to write a regex that will capture all of the following numbers from a sample text:

2.5
5
0.2
.5

Assuming its not going to be more than 2 digits on either side of the decimal point, what regex do i use?

thanks.

Answer 1

This should work.

(\d*\.?\d+)

It means

• ( begin capture group
• \d* any digit zero or more times
• \.? a period zero or one times (i.e. it is optional)
• \d+ any digit one ore more times
• ) end capture group

It will match all the number you listed and capture them in $1.