Replace with value '$' does not work in javascript

Question

i tried to replace a string, provided the string regex with a value that has $ in the end.

Can anyone tell me what is happening in

Looking into mdn string replace docs, i found it is expected.

But what should one do he want to ignore this. Means i want the replacing value should get as it is replaced, with 4 $s here.

hint: you can observe in your first attempt itself that $ in output is half the number you have given in pattern — gurvinder372
– gurvinder372, Commented Jan 15, 2016 at 9:28
what should one do he want to ignore this. - You cannot, as this is one of the language features. — thefourtheye
– thefourtheye, Commented Jan 15, 2016 at 9:29
From the reference you linked in the question, the first pattern itself says -- $$ Inserts a "$". — Abhitalks
– Abhitalks, Commented Jan 15, 2016 at 9:30
okay, but how can we develop a JS system, where client inputs a replacing string and also the replacement value in string. Should we teach client to put double $s in the end? — codeofnode
– codeofnode, Commented Jan 15, 2016 at 9:34

Wiktor Stribiżew · Accepted Answer · 2016-01-15 09:38:40Z

4

You need to double the dollars in the replacement pattern as $$ are actually $.

.replace(/{{one}}/g, '000$$$$$$$$')

See String#replace help:

Pattern Inserts
$$ Inserts a "$".

If a user types $ in the replacement (that is, in case it is user-defined) you can just double it:

var ptrn = "{{one}}"; // regex pattern from user input
var repl = "000$$$$"; // replacement from user input
var rx = RegExp(ptrn, "g"); // building a dynamic regex
document.write("pp{{one}}pp".replace(rx, repl.replace(/\$/g, '$$$$')));
//                                            ^--- doubling $s-----^

edited Jan 15, 2016 at 9:38

answered Jan 15, 2016 at 9:27

Wiktor Stribiżew

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2 Comments

codeofnode Over a year ago

okay, but how can we develop a JS system, where client inputs a replacing string and also the replacement value in string. Should we teach client to put double $s in the end?

codeofnode Over a year ago

hmm.. thats cool, i had that in my mind just a second before.

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