Regex with double asterisk javascript

I need two regular expressions, one to get ** at the beginning of a string, and one at the end.

For example:

This is a **text** test

With an expression obtain the ** of the beginning and with another those of the end. There may be many more repetitions.

I have tried the following:

(**)
^(**)
/**/
^/**/

Thanks a lot

This **would** be a good **text** to do some **testing**

It should mark all the words that contain ** at the beginning. And with the other you should mark all the ones that end with **

Answer

To match ** just before a word use:

B**b

• B – is inverse of b. It matches where b doesn’t
• b – asserts position at a word boundary i.e. (^w|w$|Ww|wW)

RegEx Demo 1

And to match ** just after a word use:

b**B

RegEx Demo 2