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4
node_modules/safe-regex/.travis.yml
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4
node_modules/safe-regex/.travis.yml
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language: node_js
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node_js:
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- "0.8"
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- "0.10"
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18
node_modules/safe-regex/LICENSE
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node_modules/safe-regex/LICENSE
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This software is released under the MIT license:
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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the Software without restriction, including without limitation the rights to
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use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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the Software, and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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node_modules/safe-regex/example/safe.js
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node_modules/safe-regex/example/safe.js
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var safe = require('../');
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var regex = process.argv.slice(2).join(' ');
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console.log(safe(regex));
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node_modules/safe-regex/index.js
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node_modules/safe-regex/index.js
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var parse = require('ret');
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var types = parse.types;
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module.exports = function (re, opts) {
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if (!opts) opts = {};
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var replimit = opts.limit === undefined ? 25 : opts.limit;
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if (isRegExp(re)) re = re.source;
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else if (typeof re !== 'string') re = String(re);
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try { re = parse(re) }
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catch (err) { return false }
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var reps = 0;
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return (function walk (node, starHeight) {
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if (node.type === types.REPETITION) {
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starHeight ++;
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reps ++;
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if (starHeight > 1) return false;
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if (reps > replimit) return false;
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}
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if (node.options) {
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for (var i = 0, len = node.options.length; i < len; i++) {
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var ok = walk({ stack: node.options[i] }, starHeight);
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if (!ok) return false;
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}
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}
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var stack = node.stack || (node.value && node.value.stack);
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if (!stack) return true;
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for (var i = 0; i < stack.length; i++) {
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var ok = walk(stack[i], starHeight);
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if (!ok) return false;
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}
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return true;
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})(re, 0);
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};
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function isRegExp (x) {
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return {}.toString.call(x) === '[object RegExp]';
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}
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47
node_modules/safe-regex/package.json
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node_modules/safe-regex/package.json
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{
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"name": "safe-regex",
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"version": "1.1.0",
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"description": "detect possibly catastrophic, exponential-time regular expressions",
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"main": "index.js",
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"dependencies": {
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"ret": "~0.1.10"
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},
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"devDependencies": {
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"tape": "^3.5.0"
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},
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"scripts": {
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"test": "tape test/*.js"
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},
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"testling": {
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"files": "test/*.js",
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"browsers": [
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"ie/8", "ie/9", "ie/10",
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"firefox/latest",
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"chrome/latest",
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"opera/latest",
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"safari/latest"
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]
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},
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"repository": {
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"type": "git",
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"url": "git://github.com/substack/safe-regex.git"
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},
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"homepage": "https://github.com/substack/safe-regex",
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"keywords": [
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"catastrophic",
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"exponential",
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"regex",
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"safe",
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"sandbox"
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],
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"author": {
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"name": "James Halliday",
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"email": "mail@substack.net",
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"url": "http://substack.net"
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},
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"license": "MIT"
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,"_resolved": "https://registry.npmjs.org/safe-regex/-/safe-regex-1.1.0.tgz"
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,"_integrity": "sha1-QKNmnzsHfR6UPURinhV91IAjvy4="
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,"_from": "safe-regex@1.1.0"
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}
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65
node_modules/safe-regex/readme.markdown
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node_modules/safe-regex/readme.markdown
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# safe-regex
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detect potentially
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[catastrophic](http://regular-expressions.mobi/catastrophic.html)
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[exponential-time](http://perlgeek.de/blog-en/perl-tips/in-search-of-an-exponetial-regexp.html)
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regular expressions by limiting the
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[star height](https://en.wikipedia.org/wiki/Star_height) to 1
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WARNING: This module merely *seems* to work given all the catastrophic regular
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expressions I could find scouring the internet, but I don't have enough of a
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background in automata to be absolutely sure that this module will catch all
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exponential-time cases.
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[](https://ci.testling.com/substack/safe-regex)
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[](http://travis-ci.org/substack/safe-regex)
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# example
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``` js
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var safe = require('safe-regex');
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var regex = process.argv.slice(2).join(' ');
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console.log(safe(regex));
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```
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```
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$ node safe.js '(x+x+)+y'
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false
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$ node safe.js '(beep|boop)*'
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true
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$ node safe.js '(a+){10}'
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false
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$ node safe.js '\blocation\s*:[^:\n]+\b(Oakland|San Francisco)\b'
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true
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```
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# methods
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``` js
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var safe = require('safe-regex')
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```
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## var ok = safe(re, opts={})
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Return a boolean `ok` whether or not the regex `re` is safe and not possibly
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catastrophic.
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`re` can be a `RegExp` object or just a string.
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If the `re` is a string and is an invalid regex, returns `false`.
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* `opts.limit` - maximum number of allowed repetitions in the entire regex.
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Default: `25`.
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# install
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With [npm](https://npmjs.org) do:
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```
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npm install safe-regex
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```
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# license
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MIT
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50
node_modules/safe-regex/test/regex.js
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50
node_modules/safe-regex/test/regex.js
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var safe = require('../');
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var test = require('tape');
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var good = [
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/\bOakland\b/,
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/\b(Oakland|San Francisco)\b/i,
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/^\d+1337\d+$/i,
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/^\d+(1337|404)\d+$/i,
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/^\d+(1337|404)*\d+$/i,
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RegExp(Array(26).join('a?') + Array(26).join('a')),
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];
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test('safe regex', function (t) {
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t.plan(good.length);
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good.forEach(function (re) {
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t.equal(safe(re), true);
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});
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});
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var bad = [
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/^(a?){25}(a){25}$/,
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RegExp(Array(27).join('a?') + Array(27).join('a')),
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/(x+x+)+y/,
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/foo|(x+x+)+y/,
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/(a+){10}y/,
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/(a+){2}y/,
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/(.*){1,32000}[bc]/
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];
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test('unsafe regex', function (t) {
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t.plan(bad.length);
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bad.forEach(function (re) {
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t.equal(safe(re), false);
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});
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});
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var invalid = [
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'*Oakland*',
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'hey(yoo))',
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'abcde(?>hellow)',
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'[abc'
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];
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test('invalid regex', function (t) {
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t.plan(invalid.length);
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invalid.forEach(function (re) {
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t.equal(safe(re), false);
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});
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});
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