Substitute integers and dots with regex [duplicate]

Question

I have the following string and I need to substitute the numbers and dot with a star:

FOO_BAR_FOOBA_1_R:FOO_1.0

I tried the following but I just managed to substitute the last part, is there a way that I can do it with a single regex search? Or do I need to parse it twice?

Regex I tried is: (\d.\d). That one catches the last part but not the beginning.

I am using PHP so below is the code that I have so far:

$re = '/(\d.\d)/';
$str = 'FOO_BAR_FOOBA_1_R:FOO_1.0';
$subst = '*';

$result = preg_replace($re, $subst, $str);

echo "The result is".$result;

If I use \d I get all the integers but not the dot plus multiple stars.

Answer 1

Your regex:

(\d.\d)

is looking for a number, any non new line character (. is a special character in regex), and again a number. The only place that occurs in your string is at the end. For a demo of this see: https://regex101.com/r/vHef6Q/2/

You could use:

\d+(\.\d+)?

to find any numbers with an optional decimal part.

Demo: https://regex101.com/r/vHef6Q/1/

Be careful with .s in regexs. Also use quantifiers if multiple values are allowed. \d is a single integer, for numbers greater than 9 you need a +. This also is the answer to why you get multiple starts when you just use \d.