Question

Vistas

I want to split string for ">" but not when >> in JavaScript.

But once I am doing a split const words = str.split('>'); it is splitting >> as well.

Currently, after the split I look for "> >" and then substitute them with ">>".

How to implement it properly.

about 4 years ago · Juan Pablo Isaza

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Accepted Answer · 2022-07-03T10:43:23.625Z

You can use a regular expression leveraging:

Negative lookbehind (?>!) causing a group to not be considered when the pattern matches before the main expression
Negative lookahead (?!) causing a group to not be considered when the pattern matches after the main expression

The resulting pattern would be as follows:

/(?<!>)>(?!>)/

Using the patter to tokenize an input would lead the desired results:

"here>>I>am".split(/(?<!>)>(?!>)/) // => [ 'here>>I', 'am' ]