CODEWITHSUNDEEP
node.jsregex
Srihari Mohan
Srihari Mohan

Reputation: 145

Regular expression to exclude a string/character in nodejs

Currently I have a variable that has turnallplugsoffR1, turnallplugsonR1. I wanted to exclude R1 from the string and get only turnallplugsoff in my variable in nodejs. Could you please help me in achieving the same? dataval="turnallplugsoffR1"

var room_value=dataval.match(/R[0-9]+/i); //matched R1/R2 any other string
    console.log(excl); // i want only turnallplugsoff. I dont want R1/R2 
    console.log(room_value[0]);

Upvotes: 1

Views: 492

Answers (2)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626893

You may remove R followed with any 1+ digits at the end of the string:

var room_value=dataval.replace(/R\d+$/, '')

Details

  • R - a R letter
  • \d+ - 1 or more digits
  • $ - end of string.

var dataval="turnallplugsoffR1";
var room_value=dataval.replace(/R\d+$/, '');
console.log(room_value);

You may also get both the values with one matching operation using

dataval.match(/^(.*)(R\d+)$/)

Here, ^ matches the start of the string, (.*) captures into Group 1 any 0+ chars other than line break chars up to the last R followed with digits at the end of the string (R\d+)$ capturing the R+digits into Group 2.

See the JS demo:

var dataval="turnallplugsoffR1";
var res = dataval.match(/^(.*)(R\d+)$/);
if (res) {
  console.log(res[1]); // turnallplugsoff
  console.log(res[2]); // R1
}

Upvotes: 2

Sunil Lama
Sunil Lama

Reputation: 4539

Just split the string with R1 and get the value you want.

dataval="turnallplugsoffR1"
var room_value= dataval.split('R1');
alert(data[0]);

Upvotes: 0

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