Return only text before last underscore in JavaScript string

Question

If I have a string like so:

var str = 'Arthropoda_Arachnida_Zodariidae_Habronestes_hunti';

How can I get just the first part of the string before the last underscore?

In this case I want just 'Arthropoda_Arachnida_Zodariidae_Habronestes'

You can use a RegExp "Arthropoda_Arachnida_Zodariidae_Habronestes_hunti".replace(/(.*)_.*$/g, "$1") — user6445533
– user6445533, Commented Jul 5, 2016 at 16:26

andrunix · Accepted Answer · 2016-07-05 16:18:05Z

11

Slice and lastIndexOf:

str.slice(0, str.lastIndexOf('_'));

answered Jul 5, 2016 at 16:18

andrunix

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5 Comments

James Long Over a year ago

Beat me by 26 seconds

Valor_ Over a year ago

yep! :D you are the winner! :D Fell free to upvote, since i don't wan't to be in -1 ;) I will accept this answer in 8 minuts

andrunix Over a year ago

Ha James. That always happens to me. Type up a long answer and someone has already answered before me. :)

Cos Over a year ago

This doesn't include the last character before the underscore (the "s")

andrunix Over a year ago

Not sure how you got that Cos. It does for me both in the browser and in Node.

James Long · Accepted Answer · 2016-07-05 16:18:31Z

1

Combining substr and lastIndexOf should give you what you want.

var str = "Arthropoda_Arachnida_Zodariidae_Habronestes_hunti";
var start = str.substr(0, str.lastIndexof("_"));
// -> "Arthropoda_Arachnida_Zodariidae_Habronestes"

answered Jul 5, 2016 at 16:18

James Long

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Comments

Jaydip Jadhav · Accepted Answer · 2016-07-05 16:25:14Z

1

try this also

var str = "Arthropoda_Arachnida_Zodariidae_Habronestes_hunti";
alert(str.substring(str.lastIndexOf("_")+1)) //to get Last word

alert(str.substring(0,str.lastIndexOf("_")))  //to get first part

edited Jul 5, 2016 at 16:25

answered Jul 5, 2016 at 16:20

Jaydip Jadhav

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Comments

StepUp · Accepted Answer · 2016-07-05 16:26:13Z

1

It is possible by using split method:

var s2= 'Arthropoda_Arachnida_Zodariidae_Habronestes_hunti';
var s1= s2.substr(0, s2.lastIndexOf('_'));

or:

var str = 'Arthropoda_Arachnida_Zodariidae_Habronestes_hunti';
str.split('_',4)

edited Jul 5, 2016 at 16:26

answered Jul 5, 2016 at 16:16

StepUp

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