diff --git a/lib/rules/no-extra-parens.js b/lib/rules/no-extra-parens.js
index a5488c3c1c6..a3dd5bab699 100644
--- a/lib/rules/no-extra-parens.js
+++ b/lib/rules/no-extra-parens.js
@@ -307,13 +307,13 @@ module.exports = {
          */
         function requiresLeadingSpace(node) {
             const leftParenToken = sourceCode.getTokenBefore(node);
-            const tokenBeforeLeftParen = sourceCode.getTokenBefore(node, 1);
-            const firstToken = sourceCode.getFirstToken(node);
+            const tokenBeforeLeftParen = sourceCode.getTokenBefore(leftParenToken, { includeComments: true });
+            const tokenAfterLeftParen = sourceCode.getTokenAfter(leftParenToken, { includeComments: true });
 
             return tokenBeforeLeftParen &&
                 tokenBeforeLeftParen.range[1] === leftParenToken.range[0] &&
-                leftParenToken.range[1] === firstToken.range[0] &&
-                !astUtils.canTokensBeAdjacent(tokenBeforeLeftParen, firstToken);
+                leftParenToken.range[1] === tokenAfterLeftParen.range[0] &&
+                !astUtils.canTokensBeAdjacent(tokenBeforeLeftParen, tokenAfterLeftParen);
         }
 
         /**
diff --git a/lib/rules/operator-assignment.js b/lib/rules/operator-assignment.js
index c4c8671f327..6820793439c 100644
--- a/lib/rules/operator-assignment.js
+++ b/lib/rules/operator-assignment.js
@@ -214,12 +214,12 @@ module.exports = {
                             ) {
                                 rightText = `${sourceCode.text.slice(operatorToken.range[1], node.right.range[0])}(${sourceCode.getText(node.right)})`;
                             } else {
-                                const firstRightToken = sourceCode.getFirstToken(node.right);
+                                const tokenAfterOperator = sourceCode.getTokenAfter(operatorToken, { includeComments: true });
                                 let rightTextPrefix = "";
 
                                 if (
-                                    operatorToken.range[1] === firstRightToken.range[0] &&
-                                    !astUtils.canTokensBeAdjacent({ type: "Punctuator", value: newOperator }, firstRightToken)
+                                    operatorToken.range[1] === tokenAfterOperator.range[0] &&
+                                    !astUtils.canTokensBeAdjacent({ type: "Punctuator", value: newOperator }, tokenAfterOperator)
                                 ) {
                                     rightTextPrefix = " "; // foo+=+bar -> foo= foo+ +bar
                                 }
diff --git a/lib/rules/utils/ast-utils.js b/lib/rules/utils/ast-utils.js
index e10544dd61e..82156a34ec9 100644
--- a/lib/rules/utils/ast-utils.js
+++ b/lib/rules/utils/ast-utils.js
@@ -1357,17 +1357,65 @@ module.exports = {
      * next to each other, behavior is undefined (although it should return `true` in most cases).
      */
     canTokensBeAdjacent(leftValue, rightValue) {
+        const espreeOptions = {
+            ecmaVersion: espree.latestEcmaVersion,
+            comment: true,
+            range: true
+        };
+
         let leftToken;
 
         if (typeof leftValue === "string") {
-            const leftTokens = espree.tokenize(leftValue, { ecmaVersion: 2015 });
+            let tokens;
+
+            try {
+                tokens = espree.tokenize(leftValue, espreeOptions);
+            } catch (e) {
+                return false;
+            }
+
+            const comments = tokens.comments;
+
+            leftToken = tokens[tokens.length - 1];
+            if (comments.length) {
+                const lastComment = comments[comments.length - 1];
 
-            leftToken = leftTokens[leftTokens.length - 1];
+                if (lastComment.range[0] > leftToken.range[0]) {
+                    leftToken = lastComment;
+                }
+            }
         } else {
             leftToken = leftValue;
         }
 
-        const rightToken = typeof rightValue === "string" ? espree.tokenize(rightValue, { ecmaVersion: 2015 })[0] : rightValue;
+        if (leftToken.type === "Shebang") {
+            return false;
+        }
+
+        let rightToken;
+
+        if (typeof rightValue === "string") {
+            let tokens;
+
+            try {
+                tokens = espree.tokenize(rightValue, espreeOptions);
+            } catch (e) {
+                return false;
+            }
+
+            const comments = tokens.comments;
+
+            rightToken = tokens[0];
+            if (comments.length) {
+                const firstComment = comments[0];
+
+                if (firstComment.range[0] < rightToken.range[0]) {
+                    rightToken = firstComment;
+                }
+            }
+        } else {
+            rightToken = rightValue;
+        }
 
         if (leftToken.type === "Punctuator" || rightToken.type === "Punctuator") {
             if (leftToken.type === "Punctuator" && rightToken.type === "Punctuator") {
@@ -1379,6 +1427,9 @@ module.exports = {
                     MINUS_TOKENS.has(leftToken.value) && MINUS_TOKENS.has(rightToken.value)
                 );
             }
+            if (leftToken.type === "Punctuator" && leftToken.value === "/") {
+                return !["Block", "Line", "RegularExpression"].includes(rightToken.type);
+            }
             return true;
         }
 
@@ -1393,6 +1444,10 @@ module.exports = {
             return true;
         }
 
+        if (leftToken.type === "Block" || rightToken.type === "Block" || rightToken.type === "Line") {
+            return true;
+        }
+
         return false;
     },
 
diff --git a/package.json b/package.json
index 1ed4064cf15..4bb294e8c60 100644
--- a/package.json
+++ b/package.json
@@ -55,7 +55,7 @@
     "eslint-scope": "^5.0.0",
     "eslint-utils": "^1.4.3",
     "eslint-visitor-keys": "^1.1.0",
-    "espree": "^6.1.2",
+    "espree": "^6.2.0",
     "esquery": "^1.0.1",
     "esutils": "^2.0.2",
     "file-entry-cache": "^5.0.1",
diff --git a/tests/lib/rules/no-extra-parens.js b/tests/lib/rules/no-extra-parens.js
index 2766a135590..13df7dc1ed1 100644
--- a/tests/lib/rules/no-extra-parens.js
+++ b/tests/lib/rules/no-extra-parens.js
@@ -2221,6 +2221,20 @@ ruleTester.run("no-extra-parens", rule, {
             code: "var foo = { [((bar1, bar2))]: baz };",
             output: "var foo = { [(bar1, bar2)]: baz };",
             errors: [{ messageId: "unexpected" }]
-        }
+        },
+
+        // adjacent tokens tests for division operator, comments and regular expressions
+        invalid("a+/**/(/**/b)", "a+/**//**/b", "Identifier"),
+        invalid("a+/**/(//\nb)", "a+/**///\nb", "Identifier"),
+        invalid("a in(/**/b)", "a in/**/b", "Identifier"),
+        invalid("a in(//\nb)", "a in//\nb", "Identifier"),
+        invalid("a+(/**/b)", "a+/**/b", "Identifier"),
+        invalid("a+/**/(b)", "a+/**/b", "Identifier"),
+        invalid("a+(//\nb)", "a+//\nb", "Identifier"),
+        invalid("a+//\n(b)", "a+//\nb", "Identifier"),
+        invalid("a+(/^b$/)", "a+/^b$/", "Literal"),
+        invalid("a/(/**/b)", "a/ /**/b", "Identifier"),
+        invalid("a/(//\nb)", "a/ //\nb", "Identifier"),
+        invalid("a/(/^b$/)", "a/ /^b$/", "Literal")
     ]
 });
diff --git a/tests/lib/rules/no-implicit-coercion.js b/tests/lib/rules/no-implicit-coercion.js
index 49e7b1e70a7..73bfe7df6d8 100644
--- a/tests/lib/rules/no-implicit-coercion.js
+++ b/tests/lib/rules/no-implicit-coercion.js
@@ -345,6 +345,16 @@ ruleTester.run("no-implicit-coercion", rule, {
                 data: { recommendation: "Number(foo)" },
                 type: "UnaryExpression"
             }]
+        },
+        {
+            code: "let x ='' + 1n;",
+            output: "let x =String(1n);",
+            parserOptions: { ecmaVersion: 2020 },
+            errors: [{
+                messageId: "useRecommendation",
+                data: { recommendation: "String(1n)" },
+                type: "BinaryExpression"
+            }]
         }
     ]
 });
diff --git a/tests/lib/rules/operator-assignment.js b/tests/lib/rules/operator-assignment.js
index b7174b9ee72..f690f7eb7f9 100644
--- a/tests/lib/rules/operator-assignment.js
+++ b/tests/lib/rules/operator-assignment.js
@@ -363,6 +363,21 @@ ruleTester.run("operator-assignment", rule, {
         output: "foo= foo/bar", // tokens can be adjacent
         options: ["never"],
         errors: UNEXPECTED_OPERATOR_ASSIGNMENT
+    }, {
+        code: "foo/=/**/bar",
+        output: "foo= foo/ /**/bar", // // tokens cannot be adjacent, insert a space between
+        options: ["never"],
+        errors: UNEXPECTED_OPERATOR_ASSIGNMENT
+    }, {
+        code: "foo/=//\nbar",
+        output: "foo= foo/ //\nbar", // // tokens cannot be adjacent, insert a space between
+        options: ["never"],
+        errors: UNEXPECTED_OPERATOR_ASSIGNMENT
+    }, {
+        code: "foo/=/^bar$/",
+        output: "foo= foo/ /^bar$/", // // tokens cannot be adjacent, insert a space between
+        options: ["never"],
+        errors: UNEXPECTED_OPERATOR_ASSIGNMENT
     }, {
         code: "foo+=+bar",
         output: "foo= foo+ +bar", // tokens cannot be adjacent, insert a space between
diff --git a/tests/lib/rules/utils/ast-utils.js b/tests/lib/rules/utils/ast-utils.js
index 1acc227015a..dfa494fb6dc 100644
--- a/tests/lib/rules/utils/ast-utils.js
+++ b/tests/lib/rules/utils/ast-utils.js
@@ -1342,7 +1342,27 @@ describe("ast-utils", () => {
             [["++", "+"], false],
             [["--", "-"], false],
             [["+", "++"], false],
-            [["-", "--"], false]
+            [["-", "--"], false],
+            [["a/", "b"], true],
+            [["a/", "+b"], true],
+            [["a+", "/^regex$/"], true],
+            [["a/", "/^regex$/"], false],
+            [["a+", "/**/b"], true],
+            [["a/", "/**/b"], false],
+            [["a+", "//\nb"], true],
+            [["a/", "//\nb"], false],
+            [["a/**/", "b"], true],
+            [["/**/a", "b"], false],
+            [["a", "/**/b"], true],
+            [["a", "b/**/"], false],
+            [["a", "//\nb"], true],
+            [["a", "b//"], false],
+            [["#!/usr/bin/env node", "("], false],
+            [["123invalidtoken", "("], false],
+            [["(", "123invalidtoken"], false],
+            [["(", "1n"], true],
+            [["1n", "+"], true],
+            [["1n", "in"], false]
         ]);
 
         CASES.forEach((expectedResult, tokenStrings) => {
@@ -1350,6 +1370,16 @@ describe("ast-utils", () => {
                 assert.strictEqual(astUtils.canTokensBeAdjacent(tokenStrings[0], tokenStrings[1]), expectedResult);
             });
         });
+
+        it("#!/usr/bin/env node, (", () => {
+            assert.strictEqual(
+                astUtils.canTokensBeAdjacent(
+                    { type: "Shebang", value: "#!/usr/bin/env node" },
+                    { type: "Punctuator", value: "(" }
+                ),
+                false
+            );
+        });
     });
 
     describe("equalTokens", () => {