How to split a string using split(<regexp>) and get the separators? [duplicate]

Question

I would like to split the following string at each letter using String.prototype.split(/[a-zA-Z]/):

'M 10 10L 150 300'

The result:

[ "", " 10 10", " 150 300" ]

But I want to receive this:

[ "", "M 10 10", "L 150 300" ]

What is the fastest way to get that result using JavaScript?

This comes close: input.split(/(?=[A-Za-z])/)

Tim Biegeleisen
– Tim Biegeleisen

2018-01-04 01:39:56 +00:00
Commented Jan 4, 2018 at 1:39 — Tim Biegeleisen
– Tim Biegeleisen, Commented Jan 4, 2018 at 1:39

akuiper · Accepted Answer · 2018-01-04 01:41:25Z

1

Try use match with /[a-zA-Z][^a-zA-Z]*/g to capture a letter and the following non letter characters:

let s = 'M 10 10L 150 300'

console.log(
  s.match(/^[^a-zA-Z]+|[a-zA-Z][^a-zA-Z]*/g)   // ^[^a-zA-Z]+ to include the case when 
                                               // the string doesn't begin with a letter
)

edited Jan 4, 2018 at 1:41

answered Jan 4, 2018 at 1:37

akuiper

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3 Comments

Tim Biegeleisen Over a year ago

This is missing the first empty string entry.

akuiper Over a year ago

@TimBiegeleisen Yeah. Not sure how critical it is.

jak.b Over a year ago

@Psidom, Not critical!!! :)

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