test: remove unneeded m flag on regular expressions

The m flag has no effect on regular expressions that don't match the
start or the end of a line.

PR-URL: #38124
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

test/js-native-api/test_exception/testFinalizerException.js

@@ -29,4 +29,4 @@ const child = spawnSync(process.execPath, [
   '--expose-gc', __filename, 'child'
 ]);
 assert.strictEqual(child.signal, null);
-assert.match(child.stderr.toString(), /Error during Finalize/m);
+assert.match(child.stderr.toString(), /Error during Finalize/);

test/parallel/test-readline-async-iterators.js

@@ -39,7 +39,7 @@ async function testSimple() {
       expectedLines.pop();
     }
     assert.deepStrictEqual(iteratedLines, expectedLines);
-    assert.strictEqual(iteratedLines.join(''), fileContent.replace(/\n/gm, ''));
+    assert.strictEqual(iteratedLines.join(''), fileContent.replace(/\n/g, ''));
   }
 }
 

test/report/test-report-uv-handles.js

@@ -97,14 +97,14 @@ if (process.argv[2] === 'child') {
 
     // Test libuv handle key order
     {
-      const get_libuv = /"libuv":\s\[([\s\S]*?)\]/gm;
-      const get_handle_inner = /{([\s\S]*?),*?}/gm;
+      const get_libuv = /"libuv":\s\[([\s\S]*?)\]/g;
+      const get_handle_inner = /{([\s\S]*?),*?}/g;
       const libuv_handles_str = get_libuv.exec(stdout)[1];
       const libuv_handles_array = libuv_handles_str.match(get_handle_inner);
       for (const i of libuv_handles_array) {
         // Exclude nested structure
         if (i.includes('type')) {
-          const handle_keys = i.match(/(".*"):/gm);
+          const handle_keys = i.match(/(".*"):/g);
           assert(handle_keys[0], 'type');
           assert(handle_keys[1], 'is_active');
         }