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module: cache regular expressions #3869

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module: cache regular expressions #3869

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8 changes: 5 additions & 3 deletions lib/module.js
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,9 @@ const path = require('path');
const internalModuleReadFile = process.binding('fs').internalModuleReadFile;
const internalModuleStat = process.binding('fs').internalModuleStat;

const splitRe = process.platform === 'win32' ? /[\/\\]/ : /\//;
const isIndexRe = /^index\.\w+?$/;
const shebangRe = /^\#\!.*/;

// If obj.hasOwnProperty has been overridden, then calling
// obj.hasOwnProperty(prop) will break.
Expand Down Expand Up @@ -191,7 +194,6 @@ Module._nodeModulePaths = function(from) {
// note: this approach *only* works when the path is guaranteed
// to be absolute. Doing a fully-edge-case-correct path.split
// that works on both Windows and Posix is non-trivial.
var splitRe = process.platform === 'win32' ? /[\/\\]/ : /\//;
var paths = [];
var parts = from.split(splitRe);

Expand Down Expand Up @@ -244,7 +246,7 @@ Module._resolveLookupPaths = function(request, parent) {
// Is the parent an index module?
// We can assume the parent has a valid extension,
// as it already has been accepted as a module.
var isIndex = /^index\.\w+?$/.test(path.basename(parent.filename));
var isIndex = isIndexRe.test(path.basename(parent.filename));
var parentIdPath = isIndex ? parent.id : path.dirname(parent.id);
var id = path.resolve(parentIdPath, request);

Expand Down Expand Up @@ -377,7 +379,7 @@ var resolvedArgv;
Module.prototype._compile = function(content, filename) {
var self = this;
// remove shebang
content = content.replace(/^\#\!.*/, '');
content = content.replace(shebangRe, '');

function require(path) {
return self.require(path);
Expand Down