Split string with ignore special RegEx substring

Question

I need split the string, split character is "," but must skip content in "("...")".

const paramString = "gyro (param1, param2), proximity, Ultra Wideband (UWB) support, compass";

const paramArr = paramString.match(/[^(\)\,]+(\(.+?\))?/g).map( item => item.trim() );

In my result is paramArr[2] bad.

[ "gyro (param1, param2)", "proximity", "Ultra Wideband (UWB)", "support", "compass" ]

I need result:

[ "gyro (param1, param2)", "proximity", "Ultra Wideband (UWB) support", "compass" ]

Please advise how update my RegEx.

Amir MB · Accepted Answer · 2021-08-07 01:07:12Z

2

You should use negative lookahead. You are basically selecting all commas (with spaces after them to trim them) that are not followed by a ) if there is no ( before it:

const paramString = "gyro (param1, param2), proximity, Ultra Wideband (UWB) support, compass";
const paramArr = paramString.split(/,\s*(?![^(]*\))/);

console.log(paramArr);

NOTE: it won't work for nested parentheses. It will fail in the following scenario:

const paramString = "gyro (param1, (param2)), proximity, Ultra Wideband (UWB) support, compass";

edited Aug 7, 2021 at 1:07

answered Aug 7, 2021 at 0:59

Amir MB

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Comments

Meena Pintu · Accepted Answer · 2021-08-07 03:21:20Z

1

Try below mentioned regx , this will break your string in expected tokens only.

/[\w\ ]+(\([^)]*\))?(\ \w+)?/gi

The regx breaks your string in following tokens .

gyro (param1, param2)
 proximity
 Ultra Wideband (UWB) support
 compass

Please follow the link for live demo of the regx :

https://regex101.com/r/yCYHgw/1

https://regex101.com/r/yCYHgw/2

(updated, regx to work only with non nested )

edited Aug 7, 2021 at 3:21

answered Aug 7, 2021 at 1:34

Meena Pintu

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2 Comments

doctorgu Over a year ago

I think your solution is not perfect for nested ones. It can take care continuous ) but cannot not continuous ) like gyro (param1, (param2, param3), param4). I think perfect solution for nested one is not possible with regex. In addition, you need no escape for space. So space is enough instead of \space.

Meena Pintu Over a year ago

yes, that's right it not perfect for nested all possible nested one, I think requester can check if solution for nested ones is needed or not . if it more of nested than I think there is need to have custom logic implemented to handle this.

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