javascript regex replace all occurrences, using variables & dynamic strings

Asked Feb 08 '18 at 21:40

Active Feb 08 '18 at 21:40

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I want to replace all occurrences that match a certain predefined pattern.

Here's an example:

var str = "Mr Blue has a blue house and a blue car & listens to blues!";
var replaceStr = "blue"; // dynamically fetched

var pattern = new RegExp(replaceStr, "g");
alert(str.replace(pattern, "red"));

This however, also replaces "blues" to "reds" which was not intended, so explored a bit on word search using \b.

This works when I define the replaceStr as /blue\b/, however how can I achieve this when replaceStr is dynamically fetched?

asked Feb 08 '18 at 21:40

user2793354

use `new RegExp()` https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp – epascarello Feb 08 '18 at 21:41
Combine them like normal strings: https://stackoverflow.com/questions/9213237/combining-regular-expressions-in-javascript – ctwheels Feb 08 '18 at 21:41
var replaceStr = "blue"; replaceStr += "\\b"; – Ryan Wheale Feb 08 '18 at 21:48

javascript regex replace all occurrences, using variables & dynamic strings

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