lib,test: use regular expression literals

Replace RegExp constructors with regular expression literals where
possible.
PR-URL: #12807
Backport-PR-URL: #13776
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Yuta Hiroto <hello@about-hiroppy.com>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

Author: Trott

test/parallel/test-buffer-alloc.js

@@ -984,8 +984,8 @@ Buffer.poolSize = ps;
 assert.throws(()=>Buffer.allocUnsafe(10).copy(),
 /TypeError:argumentshouldbeaBuffer/);
 
-constregErrorMsg=newRegExp('First argument must be a string, Buffer, '+
-'ArrayBuffer, Array, or array-like object.');
+constregErrorMsg=
+/Firstargumentmustbeastring,Buffer,ArrayBuffer,Array,orarray-likeobject\./;
 
 assert.throws(()=>Buffer.from(),regErrorMsg);
 assert.throws(()=>Buffer.from(null),regErrorMsg);

test/parallel/test-tls-env-bad-extra-ca.js

@@ -33,10 +33,9 @@ fork(__filename, opts)
 assert.strictEqual(status,0,'client did not succeed in connecting');
 }))
 .on('close',common.mustCall(function(){
-assert(stderr.match(newRegExp(
-'Warning: Ignoring extra certs from.*no-such-file-exists'+
-'.* load failed:.*No such file or directory'
-)),stderr);
+assert(stderr.match(
+/Warning:Ignoringextracertsfrom.*no-such-file-exists.*loadfailed:.*Nosuchfileordirectory/
+),stderr);
 }))
 .stderr.setEncoding('utf8').on('data',function(str){
 stderr+=str;

test/parallel/test-tls-key-mismatch.js

@@ -8,8 +8,8 @@ if (!common.hasCrypto) {
 constassert=require('assert');
 consttls=require('tls');
 constfs=require('fs');
-consterrorMessageRegex=newRegExp('^Error: error:0B080074:x509 '+
-'certificate routines:X509_check_private_key:key values mismatch$');
+consterrorMessageRegex=
+/^Error:error:0B080074:x509certificateroutines:X509_check_private_key:keyvaluesmismatch$/;
 
 constoptions={
 key: fs.readFileSync(common.fixturesDir+'/keys/agent1-key.pem'),

test/parallel/test-util-inherits.js

@@ -4,8 +4,7 @@ require('../common');
 constassert=require('assert');
 constinherits=require('util').inherits;
 consterrCheck=
-newRegExp('^TypeError: The super constructor to "inherits" must not be '+
-'null or undefined$');
+/^TypeError:Thesuperconstructorto"inherits"mustnotbenullorundefined$/;
 
 
 // super constructor