How is this regex [...]+ processessed?

Question

I am new to perl (beginner, learning perl for past 1 week during spare time). This is my first programming language.

I want to know how this regex []+ works in perl. I have 3 questions.

1. What will this do: if /[\d\s\.,:\/]+/?

I learned if /.../ matches pattern.

2. So will it match the following?

3. And which parts of the following will not match?

   • 335.31, 312.52
   • Dave1.532
   • Path: "./1243/453 /48.1"
   • 543, 546

Edit:

This is not a duplicate of the linked question as I am specifically asking how []+ works. The answer in the linked post does not cover this.

I know what each character in the regex I have written above represents and how each character work. What I want to know is how []+ will influence the regular expression. Specifically how the + will influence the [].

Answer 1

I suggest you use regex101.com to try the regular expression. Below is the breakdown for the expression you provided:

`[]` match a single character present in the list
`+` matches one or more of the above
`\d` match a digit [0-9]
`\s` match any white space character `[\r\n\t\f ]`
`\.` matches the character . literally
`,:` a single character in the list ,: literally
`\/` matches the character / literally

You'll get the following matches (if you run this with g- global option) - (REGEX sample - ref):

`335.31, 312.52 `
`1.532 `
`: `
`./1243/453 /48.1`
` 543, 546 `