Split stings using REGEX in javascript

Question

I'm trying to parse string into 5 parts. For example:

var str1 = '#<SYSTEM list-of / asdf-finalizers-20140826-git / quicklisp 2014-08-26>'

// filter is used to remove empty strings from the returned array
str1.split(/[ #<>/]/).filter(function(n) { return n !== ''; });

// str1[0] -> SYSTEM
// str1[1] -> list-of
// str1[2] -> asdf-finalizers-20140826-git
// str2[3] -> quicklisp
// str2[3] -> 2014-08-26

But the problem is, I can't parse the strings containing slash in the middle of words For example,

#<SYSTEM asdf-finalizers-test/1 / asdf-finalizers-20140826-git / quicklisp 2014-08-26>

What is the correct regex to parse the word asdf-finalizers-test/1? I tried these but failed.

/[(\s\/\s) #<>]/, /[(?:\s\/\s) #<>]/, /[ #<>]|(\s\/\s)/

If slashes must have spaces on either side to function as separators, then use /[ #<>]| \/ ]/. Your filter can also be written as filter(Boolean). — user663031
– user663031, Commented Sep 11, 2014 at 9:43
@torazaburo Thanks. filter(Boolean) is so handy. But /[ #<>]| \/ ]/ doesn't work. I'm using node.js 0.10.31 It is because of nodejs? — 1ambda
– 1ambda, Commented Sep 11, 2014 at 9:49
Swap the two options, so / \/ |[ #<>]/. Works in both browser and node. The problem is that if the ` / ` option is placed second, it matches on the space first before it gets to the second option, and you end up with slashes in your output. — user663031
– user663031, Commented Sep 11, 2014 at 9:55

user663031 · Accepted Answer · 2014-09-11 09:58:37Z

2

The following seems to work:

/ \/ |[ #<>]/

'#<SYSTEM asdf-finalizers-test/1 / asdf-finalizers-20140826-git / quicklisp 2014-08-26>'.split(/ \/ |[ #<>]/).filter(Boolean)
> [ 'SYSTEM',
    'asdf-finalizers-test/1',
    'asdf-finalizers-20140826-git',
    'quicklisp',
    '2014-08-26' ]

answered Sep 11, 2014 at 9:58

user663031

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Comments

Avinash Raj · Accepted Answer · 2014-09-11 09:42:54Z

1

You could use a negative lookahead to not to split according to / when it is followed by a word character.

> var s = "#<SYSTEM asdf-finalizers-test/1 / asdf-finalizers-20140826-git / quicklisp 2014-08-26>"
> s.split(/[ #<>]|\/(?!\w)/).filter(function(n) { return n !== ''; });
[ 'SYSTEM',
  'asdf-finalizers-test/1',
  'asdf-finalizers-20140826-git',
  'quicklisp',
  '2014-08-26' ]

answered Sep 11, 2014 at 9:42

Avinash Raj

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