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Regex for bad words
If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. As of version 2, requires you either have an environment that understands ES and beyond or a transpiler like Babel. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
MIT License. Releases 28 v1. Aug 2, You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.Regular Expressions is nothing but a pattern to match for each input line.
See these posts Help on Regex and Help Bulilding a regex for other invalidate examples. A regular expression or RE specifies a set of strings that matches it; the functions in this module let you check if a particular string matches a given regular expression or if a given regular expression matches a particular string, which comes down to the same thing.
The regular expression matches the words an, annual, announcement, and antique, and correctly fails to match autumn and all. This project aims to make available a list of regular expression which match vulgar words. Like 42 times worse!! Allow the use of regex for the bad words list What is regex?
A regular expression, regex or regexp sometimes called a rational expression is a sequence of characters that define a search pattern.
Best practices for regular expressions in .NET
We will this problem in python very quickly using Dictionary Data Structure. Now, if you want to disallow both "like" and "as if", the modification is simple: Overview. Even though I construct an additional dictionary, my diagnostic tool shows me coming in at less memory consumed than my previous solution.
If disabled, even words with substrings matching the expression will be identified e. Regular expressions take the usability of bad words filtering to yet another level, giving developers the possiblity to search for patterns within user input text. There are many so when writing, you can find many. Not only it is a bad idea in general to implement it, but you may be tempted to do it using regular expressions, and you'll do it wrong.
A Regular Expression is basically a special text string for describing the search pattern. For instance, the regular expression. When parsing human writing. Here I dont find realistic example. If you want to have all possible matches, you must edit the bad word files to your liking. Here is a to RegEx documentation: perlre - perldoc. You are currently viewing LQ as a guest. It can contain up to bytes.
You should fetch your bad word into a string List or string Array and use System. Languages Contains over 5' of regular 6. Load text — get all regexp matches.Blog How-tos. By Liz Bennett 18 Jun Regular expressions are incantations that we developers wield mightily when the time calls. Yet, do we always wield them deftly? Regular expressions are a delicate and precise language. They are crafted with careful deliberation into powerful forces that level text like a perfectly thrown bowling ball, knocking over all 10 pins with an instant and dazzling smash.
A regular expression that is naively thrown together is like a drunkard who trips and stumbles over text, clumsily managing to roll the bowling ball down the lane, maybe hitting a pin or two.
What, you ask, would be the difference between these two regular expressions? What is it that makes a good regular expression and a bad one? Well, sit close, and I shall reveal the mechanisms that power these incredible tools. Before we begin, I should add that this post assumes you have a good understanding of how to construct and use regexes.
It contains an in-depth tutorial and plenty of information to get you started. Which regular expression would you say is the bad one and which is the better one?
You probably guessed right, so how about a harder question: How much worse would you say the bad one is from the better? What kinds of input would cause the bad regex to perform much worse than the other? The second regular expression is indeed better than the first. Why is that? A good indicator is that it is longer. This causes good regular expressions to run faster as they predict their input more accurately. In the above example, we know that our matching input will always start with a time stamp.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I'm a regular expression newbie, and I can't quite figure out how to write a single regular expression that would "match" any duplicate consecutive words such as:.
If there are 3 phrases that are identical, it matches. That is an irregular grammar. Try this regex that can catch 2 or more duplicates words and only leave behind one single word. And the duplicate words need not even be consecutive. Example Source. The below expression should work correctly to find any number of consecutive words. The matching can be case insensitive.
If you don't mind that limitation, the accepted answer is fine. Since some developers are coming to this page in search of a solution which not only eliminates duplicate consecutive non-whitespace substrings, but triplicates and beyond, I'll show the adapted pattern.
This pattern greedily matches a "whole" non-whitespace substring, then requires one or more copies of the matched substring which may be delimited by one or more whitespace characters space, tab, newline, etc.
This expression inspired from Mike, above seems to catch all duplicates, triplicates, etc, including the ones at the end of the string, which most of the others don't:. I know the question asked to match duplicates only, but a triplicate is just 2 duplicates next to each other :.
Learn more. Asked 10 years, 2 months ago. Active 4 months ago. Viewed 87k times. I'm a regular expression newbie, and I can't quite figure out how to write a single regular expression that would "match" any duplicate consecutive words such as: Paris in the the spring.
Not that that is related. Why are you laughing? Are my my regular expressions THAT bad?? Is there a single regular expression that will match ALL of the bold strings above? Joshua Joshua 5, 15 15 gold badges 49 49 silver badges 74 74 bronze badges. Joshua: Yes, some people not too few let this site do their homework for them. But asking homework questions is not a bad thing to do on SO, when they are tagged as such. Usually the style of the answers changes from "here is the solution" to "here are some things you have not thought about", and that is a good thing.
Somebody has to try and keep up the distinction, in his case it was me, and elsewhere "other people" do the same thing. That's all. Hope to never see a question like "This sounds a bit like a workplace question. Is it? Active Oldest Votes.
Gumbo Gumbo k 98 98 gold badges silver badges bronze badges. Just a warning, this does not handle words with apostrophes or as Noel mentions hypens. Mike Viens Mike Viens 2, 3 3 gold badges 15 15 silver badges 21 21 bronze badges.The regular expression engine in. NET is a powerful, full-featured tool that processes text based on pattern matches rather than on comparing and matching literal text. In most cases, it performs pattern matching rapidly and efficiently.
However, in some cases, the regular expression engine can appear to be very slow. In extreme cases, it can even appear to stop responding as it processes a relatively small input over the course of hours or even days.
This topic outlines some of the best practices that developers can adopt to ensure that their regular expressions achieve optimal performance. When using System. RegularExpressions to process untrusted input, pass a timeout. A malicious user can provide input to RegularExpressions causing a Denial-of-Service attack. In general, regular expressions can accept two types of input: constrained or unconstrained.
Constrained input is text that originates from a known or reliable source and follows a predefined format. Unconstrained input is text that originates from an unreliable source, such as a web user, and may not follow a predefined or expected format.
Regular expression patterns are typically written to match valid input. That is, developers examine the text that they want to match and then write a regular expression pattern that matches it.
Developers then determine whether this pattern requires correction or further elaboration by testing it with multiple valid input items. When the pattern matches all presumed valid inputs, it is declared to be production-ready and can be included in a released application. This makes a regular expression pattern suitable for matching constrained input.
However, it does not make it suitable for matching unconstrained input. To match unconstrained input, a regular expression must be able to efficiently handle three kinds of text:. The last text type is especially problematic for a regular expression that has been written to handle constrained input. If that regular expression also relies on extensive backtrackingthe regular expression engine can spend an inordinate amount of time in some cases, many hours or days processing seemingly innocuous text.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In the following example I am trying to match s or season but what I have matches seao and n. Square brackets are meant for character class, and you're actually trying to match any one of: s, s againeas againo and n. Note: Non-capture groups tell the engine that it doesn't need to store the match, while the other one capturing group does.
For small stuff, either works, for 'heavy duty' stuff, you might want to see first if you need the match or not. If you don't, better use the non-capture group to allocate more memory for calculation instead of storing something you will never need to use.
I'll be using the phpsh interactive shell on Ubuntu Variables gun1 and gun2 contain the string dart or fart which is correct, but gun3 contains darty and still matches, that is the problem. So onto the next example. Now if u need this specific word with boundaries, not inside any other signs-letters.
Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I am trying to create a bad word filter method that I can call before every insert and update to check the string for any bad words and replace with "[Censored]".
I have an SQL table with has a list of bad words, I want to bring them back and add them to a List or string array and check through the string of text that has been passed in and if any bad words are found replace them and return a filtered string back. Please see this "clbuttic" or for your case cl[Censored]ic article before doing a string replace without considering word boundaries:.
Obviously not foolproof see article above - this approach is so easy to get around or produce false positives I've had no [Censored] sleep for [Censored] [Censored] days - the next door neighbour is playing classical music at full tilt! Note that "classical" does not become "cl[Censored]ical", as whole words are matched with the regular expression.
Although I'm a big fan of Regex, I think it won't help you here. You should fetch your bad word into a string List or string Array and use System.
Replace on your incoming message. In the sample, mayContainBadWords is the string you want to check; badWords is a string array, you load from your bad word sql table and cleanString is your result.
There is also a nice article about it which can e found here. With a little html-parsing skills, you can get a large list with swear words from noswear. Learn more.
Replace Bad words using Regex Ask Question. Asked 9 years, 11 months ago. Active 9 years, 11 months ago. Viewed 6k times. I am using C for this. MartGriff MartGriff 2, 7 7 gold badges 35 35 silver badges 42 42 bronze badges.
Gave you a vote just for calling them 'Bad Words'. Active Oldest Votes. Replace current, CensoredText ; Console. WriteLine output ; Gives the output: I've had no [Censored] sleep for [Censored] [Censored] days - the next door neighbour is playing classical music at full tilt! Still looks pretty offensive! Tim Lloyd Tim Lloyd Good background article.
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