Question 253032 in Javascript Question posted in
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How to replace the last occurence of } in a multiline string in Javascript?

How to replace the last occurence of } in a multiline string in Javascript?

The method from how to replace last occurrence of a word in javascript? doesn’t work in the case of a multiline string:

"line1}hellon}nline2}abc".replace(/(.*)}/g, "$1");
// "line1hellonnline2abc"

because in this case every } is replaced, which I don’t want.

Note: it’s not a duplicate of Replace last occurrence of character in string because my question is specifically about multiline strings, and the linked question is not.

Tags:

3

Answers


  1. 0

    You just need to change the modifier from g (global) to s (single line):

    "line1}hellon}nline2}abc".replace(/(.*)}/s, "$1");
// "line1}hellon}nline2abc"

    You don’t need g at all since you want to perform a single match.
    By default, the regex is performed per line, but using s will treat the input string as a single line.

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  2. 0

    You can use /}(?=[^n]*$)/gm for remove } in every line.

    const str = "line1}hellon}nline2}abc";

const result = str.replace(/}(?![sS]*})/, '|');

console.log(result)

    This regex works by looking for a } character that is not followed by another } character anywhere at the rest of the string.

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  3. 0

    You can use something like this:

    const str = `line1}hello
}
line2}abc`;

const result = str.replace(/}(?=[^}]*$)/, '');

console.log(result)

    Regex explanation:

    /}(?=[^}]*$)/
    • / – start delimiter
    • } – find literal closing curly brace
    • (?=[^}]*$) – ahead of me is no other closing curly brace till the end of the string (not line)
    • / – end delimiter
    • Notice no flags; important

    By not using the multiline flag /m, the $ behaves as a end-of-string meta escape instead of end-of-line.

    https://regex101.com/r/Ausg5r/1

    Do note that PCRE has a dedicated meta escape for end-of-string z but JS does not.

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