Multiple conditions regex JavaScript split

Question

I'd like to split a string if:

It doesn't starts with a quatre or a soixante AND
It doesn't ends with a dix or a vingt

For example:

'deux-cent-quatre-vingt-trois'.split(/**/);
> ['deux', 'cent', 'quatre-vingt', 'trois' ]

I've had a few tries and failures, for example:

'deux-cent-quatre-vingt-dix-trois'
          .split(/^(?![quatre|soixante]-[dix|vingt])(\w*)-(\w*)/);
> [ '', 'deux', 'cent', '-quatre-vingt-trois' ]

or:

'deux-cent-quatre-vingt-dix-trois'.split(/(?!quatre|soixante)-(?!vingt|dix)/);
> [ 'deux' 'cent', 'quatre-vingt', 'trois' ]

which works, but this does not:

'cent-vingt'.split(/(?!quatre|soixante)-(?!vingt|dix)/);
> [ 'cent-vingt' ]

I know using a matcher or a find would be so easy, but it would be great to do it in a single split...

Hmm... It seems like javascript doesn't support lookbehinds.. Are you trying to separate all the french numbers from zero to quatre-vingt-dix-neuf + cent? — Leonard Pauli
– Leonard Pauli, Commented Jul 29, 2013 at 17:37
Yes, more or less. It's for a module I've been working on, readint. It's a written number parser. I'm trying to keep it as simple as possible to make the translating process easier. I only do one split, to identify and mark number tokens. — nmussy
– nmussy, Commented Jul 29, 2013 at 17:40

Casimir et Hippolyte · Accepted Answer · 2013-07-29 18:55:11Z

1

You can do it like this:

var text = "deux-cent-quatre-vingt-trois";

console.log(text.split(/(?:^|-)(quatre-vingt(?:-dix|s$)?|soixante-dix|[^-]+)/));

The idea is to add a capturing group whose content is added to the split list.

The capturing group contains at first particular cases and after the most general, described with [^-]+ (all that is not a -)

Notice: since quatre-vingt is written with a s when it is not followed by a number, i added s$ as a possibility.

edited Jul 29, 2013 at 18:55

answered Jul 29, 2013 at 17:54

Casimir et Hippolyte

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2 Comments

user2587132 Over a year ago

suppose one needs to prevent the '-' followed by 'quatre' alone from getting removed in that sentence, what is the regex for that? If possible please let me know, I am trying to understand the answer.

nmussy Over a year ago

Either you capture quatre-vingt (or quatre-vingts, or quatre-vingt-dix), or you capture soixante-dix, or you capture whatever you find until an hyphen. That last case is what separates the elements, by capturing everything but the trailing hyphen.

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