can someone explain the below Regular Expression?,

Question

var num="55+60" 
num.match(/[\d\.]+/g)

I understood, it's finding the digits globally, but i couldn't understand the '[]','+' and '.' parts.

Answer 1

\d matches any digit from 0 to 9. \. matches a point i.e. period. [] lets you define a set of characters to match. []+ means match 1 or more of the characters in the square brackets.

[\d\.]+ will match numbers such as "45" or "45.123" but also "45.123.456" and "45...123." which may or may not be intended to be matched.

Answer 2

This means any digit or a dot between []. and when you use it with + this means any digits or dot that repeated more than once.

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