How to get the string just before specific character in JavaScript?

Question

I have couple of strings like this:

Mar18L7
Oct13H0L7

I need to grab the string like:

Mar18
Oct13H0

Could any one please help on this using JavaScript? How can I split the string at the particular character?

Many Thanks in advance.

Might not work in case of April18L7. Just in case there's a longer version of Month names somewhere. — SiddAjmera
– SiddAjmera, Commented Sep 21, 2018 at 16:03
Apart from L7 is there some other sample input you can provide so that we can generalise solution. — Shubham Gupta
– Shubham Gupta, Commented Sep 21, 2018 at 16:07
@ShubhamGupta thanks for suggestion we have some more like this Apr12R0 or Jun12R0 — Glory Raj
– Glory Raj, Commented Sep 21, 2018 at 16:10
@SiddAjmera thanks for your input, for april we denote like first three letters like this. Apr.. — Glory Raj
– Glory Raj, Commented Sep 21, 2018 at 16:11

SiddAjmera · Accepted Answer · 2018-09-21 16:10:59Z

3

For var str = 'Mar18L7';

Try any of these:

str.substr(0, str.indexOf('L7'));
str.split('L7')[0]
str.slice(0, str.indexOf('L7'))
str.replace('L7', '')

edited Sep 21, 2018 at 16:10

answered Sep 21, 2018 at 16:02

SiddAjmera

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Comments

Shubham Gupta · Accepted Answer · 2018-09-21 16:21:13Z

1

Based on input that is given it I have created following function which can take n string in array and return the output in the format you have given. Check if this helps and if some use case is missed.

function generateStr(arr, splitStr) {
  const processedStr = arr.map(value => value.split(splitStr)[0]);
  return processedStr.join(" OR ");
}

console.log(generateStr(["Mar18L7", "Oct13H0L7"], "L7"));

answered Sep 21, 2018 at 16:21

Shubham Gupta

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Comments

Yves Kipondo · Accepted Answer · 2018-09-21 16:24:40Z

1

You can use a regex like this

var data = ["Mar18L7", "Oct13H0L7"];
var regex = /^([a-zA-Z0-9]+)\L[a-zA-Z0-9]+$/;
var output = []
data.forEach(function(el){
    var matches = el.match(regex);
    output.push(matches[1]);
});

output variable will be equal to ['Mar18', 'Oct13H0'] and you can join all value usin the .join method on output array

var chain = output.join(" OR ");
// chain will be equal to "Mar18 OR Oct13H0"

answered Sep 21, 2018 at 16:24

Yves Kipondo

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1 Comment

Yves Kipondo Over a year ago

You are welcome, can you choose one of all answer like response to your issue

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