Regular expression to replace character between digit and digit?

Question

Regular Expressions

Good day. Skills in the compilation of regular seasons are not yet enough, so I decided to ask for help. For example, we have a string:
text=smth?text2=100&numbers0&1some_words_and_else_numbers=[2&3]

How can we compose a regular expression so that all parts of a string like [0&1] or 0&1 are replaced by [0,1] or 0,1. Thanks in advance!

Answer 1

.replace(/(\d)&(\d)/g, '$1,$2')