Replace a particular string with an escape character in JavaScript

Question

JavaScript

I have a string as follows:

#UNICODE#{1f600} #UNICODE#{1f600}

and I want to replace each occurrence of '#UNICODE#' with '\u', so the output should be like

\u{1f600} \u{1f600}

Tried many different regex in .replace function but no luck.

like

('#UNICODE#{1f600} #UNICODE#{1f600}').replace(/#UNICODE#/g,/\u/)
/\u/{1f600}/\u/{1f600}


('#UNICODE#{1f600} #UNICODE#{1f600}').replace(/#UNICODE#/g,\u)
Invalid unicode escape sequence

and so on.

Any bright ideas ? Thanks in advance.

This is easy to accomplish with `eval`, but there's gotta be a better way. Problem with `1F600` is that its a surrogate pair, not sure how to decompose that `\u` syntax into two separate `fromCharCode`s, or something similar — CertainPerformance, Mar 31 '20 at 08:29
Er, wait, are you looking for the computed string, eg `'\u{1f600}' === ""`, or the literal sequence of a backslash, followed by a u, followed by `{1f600}`? — CertainPerformance, Mar 31 '20 at 08:30

mplungjan · Accepted Answer · 2020-03-31T08:39:53.043

2

Escape the \\u

let str = '#UNICODE#{1f600} #UNICODE#{1f600}'.replace(/#UNICODE#/g,"\\u")

console.log(str)
str = str.replace(/\\u\{/g,"&#x").replace(/\}/g,";")
console.log(str)
document.getElementById("x").innerHTML = str

<span id="x"></span>

edited Mar 31 '20 at 08:39

answered Mar 31 '20 at 08:28

mplungjan

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Replace a particular string with an escape character in JavaScript

1 Answers1