bundler: fix regular expression literals, including their flags

It seemed that, for example, `var i` might cause a suffix to be added to the "i" flag within a regular expression literal. So the entire regular expression literal, including flags, is now corrected within the bundler.

Author: kfule

scripts/_bundler-impl.js

@@ -159,10 +159,10 @@ module.exports = async (input) => {
 
 		// fix regexp literals
 		// Note: This regexp, while it doesn't technically capture all cases a regexp could appear, should hopefully work for now.
-		const regexpLiteral = /([=({[](?:[\s\u2028\u2029]|\/\/.*?[\r\n\u2028\u2029]|\/\*[\s\S]*?\*\/)*\/)((?:[^\\\/[\r\n\u2028\u2029]|\\[^\r\n\u2028\u2029]|\[(?:[^\]\\\r\n\u2028\u2029]|\\[^\r\n\u2028\u2029])*\])+)(\/[$\p{ID_Continue}]*)/ug
-		code = code.replace(regexpLiteral, (match, open, data, close) => {
-			const fixed = data.replace(variables, (match) => match.replace(/\d+$/, ""))
-			return open + fixed + close
+		const regexpLiteral = /([=({[](?:[\s\u2028\u2029]|\/\/.*?[\r\n\u2028\u2029]|\/\*[\s\S]*?\*\/)*)(\/(?:[^\\\/[\r\n\u2028\u2029]|\\[^\r\n\u2028\u2029]|\[(?:[^\]\\\r\n\u2028\u2029]|\\[^\r\n\u2028\u2029])*\])+\/[$\p{ID_Continue}]*)/ug
+		code = code.replace(regexpLiteral, (match, pre, literal) => {
+			const fixed = literal.replace(variables, (match) => match.replace(/\d+$/, ""))
+			return pre + fixed
 		})
 
 		//fix props

scripts/tests/test-bundler.js

@@ -288,11 +288,11 @@ o.spec("bundler", async () => {
 	o("does not mess up regexp literals", async () => {
 		await setup({
 			"a.js": 'var b = require("./b")\nvar c = require("./c")',
-			"b.js": "var b = /b/\nmodule.exports = function() {return b}",
+			"b.js": "var b = /b/\nvar g = 0\nmodule.exports = function() {return b}",
 			"c.js": "var b =\n\t/ b \\/ \\/ [a-b]/g\nvar d = b/b\nmodule.exports = function() {return b}",
 		})
 
-		o(await bundle(p("a.js"))).equals(";(function() {\nvar b0 = /b/\nvar b = function() {return b0}\nvar b1 =\n\t/ b \\/ \\/ [a-b]/g\nvar d = b1/b1\nvar c = function() {return b1}\n}());")
+		o(await bundle(p("a.js"))).equals(";(function() {\nvar b0 = /b/\nvar g = 0\nvar b = function() {return b0}\nvar b1 =\n\t/ b \\/ \\/ [a-b]/g\nvar d = b1/b1\nvar c = function() {return b1}\n}());")
 	})
 	o("does not mess up properties", async () => {
 		await setup({