CODEWITHSUNDEEP
javascriptregex
ishan joshi
ishan joshi

Reputation: 270

invalid group in regular expression

i want to check anyone not enter yahoo,gmail or any group word.for that i have create regular expression as below but it gives invalid group when i try to put in javascript.

if (str.match('/^(.*?(\W|^)(?i)(yahoo|gmail|com)(\W|$))$/')) {
    return true;    
}

Upvotes: 2

Views: 1625

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 626690

The error you get is related to (?i), an inline modifier that is not supported by JS regex engine. (\W|^) is a common construct in some libraries to denote a word boundary, but in JS, here, it is easier to use a word boundary instead, \b.

I suggest

var str = "YaHoo here";
if (/\b(?:yahoo|gmail|com)\b/i.test(str)) {
  console.log("Contains forbidden word!");
} else {
  console.log("Good!");
}

Pattern details:

  • \b - a leading word boundary
  • (?:yahoo|gmail|com) - any of the 3 alternatives
  • \b - trailing word boundary

Upvotes: 4

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