Solving the issue of redundant parentheses using JavaScript's regex

When I attempt to replace ...('2073')... with ....('2074')... I end up with ...(('2074'))... and I am perplexed as to why.

Check out this javascript snippet:

var sGroupIdentifier = "2073";
var sSelectedGroupTR = "... onclick=\"MakeNewGroup('2073')\">New</a> ... ";
var rex = new RegExp("\('" + sGroupIdentifier + "'\)", "g")

sNewGroupIdentifier = "2074";
var sNewGroupTR = sSelectedGroupTR.replace(rex, "(\'" + sNewGroupIdentifier + "\')");
alert(sNewGroupTR)

I could remove the parenthesis in the .replace function, but my confusion remains. It seems like there is a match for ('2073'), not '2073' - all because of the ( instead of \

Does anyone have an explanation for this?

javascriptregex

Answer №1

When constructing the regular expression using a string literal, the sequence \( is interpreted as just ( by the regex compiler. If you want to ensure that the regex compiler sees the actual \, you must escape it within the string literal like this:

var pattern = new RegExp("\\('" + dynamicValue + "'\\)", "g");

It is generally recommended to avoid using strings to build regular expressions when possible (although in your scenario with dynamicValue being a string, there may not be an alternative).

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