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regexp-worker
Advanced tools
Readme
Execute Regular Expression Matches on a Node Worker Thread.
Regular Expressions can suffer from Catastrophic Backtracking. A very simple expression like /(x+x+)+y/
can cause your JavaScript application to freeze. This library allows you to run these expressions on another thread. If they take to long to complete, they are terminated, protecting your application from locking up.
npm install regexp-worker
In the example below:
For the occasional request, this is the easiest way, but the Worker startup and shutdown is expensive.
import { execRegExpOnWorker } from 'regexp-worker'
//...
const response = await execRegExpOnWorker(/\b\w+/g, 'Good Morning')
console.log(response.matches.map(m => m[0]))
Result:
console.log
[ 'Good', 'Morning' ]
import { execRegExpOnWorker } from 'regexp-worker'
//...
const response = await execRegExpOnWorker(/\b/g, 'Good Morning');
console.log(response.matches.map(m => m.index))
Result:
console.log
[ 0, 4, 5, 12 ]
interface ExecRegExpResult {
elapsedTimeMs: number;
matches: RegExpExecArray[];
}
Where RegExpExecArray
is RegExp.prototype.exec() result.
RegExpWorker
InstanceTo reduce the cost of starting and stopping the Worker, it is possible to create a RegExpWorker
instance.
This instance allows you to make multiple requests using the same worker. The request are queued and handled
one at a time. If a request takes too long, it is terminated and the promise is rejected with an ErrorCanceledRequest
.
import { RegExpWorker } from 'regexp-worker'
// ...
const defaultTimeOutMs = 10
const worker = new RegExpWorker(defaultTimeOutMs);
// Find all words in some text
let words = await worker.execRegExp(/\b\w+/g, 'Lots of text ...')
// Find all numbers in some text
let numbers = await worker.execRegExp(/\b\d+/g, 'Lots of text ...')
// Find 3 letter word pairs
let moreTimeMs = 100
let numbers = await worker.execRegExp(/\b\w{3}\s+\w{3}/g, 'Lots of text ...', moreTimeMs)
// ...
// It is a good idea to dispose of the worker before shutdown.
// The worker thread will stop on its own if left idle for more than 200ms.
worker.dispose();
If the request times out, the promise will be rejected with:
interface TimeoutError {
message: string;
elapsedTimeMs: number;
}
FAQs
Runs regular expressions on a background thread.
The npm package regexp-worker receives a total of 62 weekly downloads. As such, regexp-worker popularity was classified as not popular.
We found that regexp-worker demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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Streamline your login process and enhance security by enabling Single Sign-On (SSO) on the Socket platform, now available for all customers on the Enterprise plan, supporting 20+ identity providers.
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