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RegEx101.com now offers a debugger
- redox_ 13y agoWould be ultra-cool if you could propose a "generate a matching sample" button.
- Lindrian 13y agoI have thought about this, but in cases where it would be useful, it's impossible to generate a sample match string. For example, creating a match string for /(?:a|[bc])efg?/ is super simple, but for something like: /(ab(?1)*)/ it becomes much harder. Not to mention the performance hit you would see for these more complex expressions. (These are just dummy expressions for illustrative purposes, but I'm sure you get my gist.)
- codexon 13y agoIf there is a modifier with a variable number like ?,+,* you could just repeat it X times. For example if it is ? repeat 1 time, + repeat 2, * repeat 3 etc... If it is |, choose the first or choose randomly.
- joezo 13y agoTake a look at http://fent.github.io/randexp.js/ http://fent.github.io/randexp.js/ if you want something that will do this
- Lindrian 13y agoForgot to tell you how to use it. Simply insert an expression and some text and press the little red button right above the input for the regex. That's all you have to do! Enjoy :)
- deleted 13y ago[deleted]
- Jugurtha 13y agoThat's funny. Just yesterday I needed that and used pythex and a bunch of other similar 'testers' to make sure my regular expression was good. It was, but it somehow didn't work on the Mozilla Add-On Builder. After asking a question on the #jetpack channel, members have spotted the mistake: The regex was correct, but it needed to "match the exact string" as mentioned on the doc. I've read it, but didn't understand that point. There was a missing "." at the beginning and the end. So /.regex.*/ Thanks for putting this.
- WestCoastJustin 13y agohttp://rubular.com/ http://rubular.com/ is also really great! I use it often when programming ruby regular expressions. Fill in a batch of test strings into the box, then run your regular expression against it, and instantly see (visually) what is happening. This is a BIG plus coming from perl regex 10 years ago ;) This is not a dig a perl regex, but I just remember it was a trial and error loop, where I would continually be iterating the script to see if it worked, where as with this webpage, you just iterate, more quickly. They also have a great example: test string: Today's date is: 9/28/2013. regex: (?<month>\d{1,2})\/(?<day>\d{1,2})\/(?<year>\d{4}) result: month 9 day 28 year 2013 Screenshot here: http://i.imgur.com/ixyHRde.png http://i.imgur.com/ixyHRde.png
- VeejayRampay 13y agoLooking at regex101, the layout of the page looks awfully similar. It seems that the author took Rubular and made it more generic. So yeah, props to Rubular.
- eknkc 13y agohttp://www.regexper.com http://www.regexper.com is also awesome to visualize regular expressions.
- egor83 13y agoAnd a couple of alternatives: https://www.debuggex.com/ https://www.debuggex.com/ (for Python flavor: https://www.debuggex.com/?flavor=python https://www.debuggex.com/?flavor=python ) and one more Python + regex: http://www.pyregex.com/ http://www.pyregex.com/
- SmokyBorbon 13y agohttp://txt2re.com/ http://txt2re.com/ is my favorite RegEx tool. It goes beyond just testing your regular expressions against a sample. It builds the pattern for you and generates the code in different languages.
- helloTree 13y agoWhat is it with the obsession with regular expressions? They are useful things, sure, but I just use them in connection with grep or if I search for strings and normally they are pretty basic, e.g. $ grep -r -n --color "foo*bar" src If I want to validate input data with the machine I just use a parser.
- deleted 13y ago[deleted]
- hnriot 13y agoI don't think your example does what you think it does, match fo followed by o zero or more times, followed by bar. when you do understand regex, you'll be amazed at the myriad of things you can do with it.
- helloTree 13y agoYou are absolutely right, I forgot the '.'.
- ghshephard 13y agoRegexes are an elegant and very powerful way to validate data in scripts in a concise (and if they aren't abused) easy to read fashion. There are almost infinite number of examples, but let's say I want to verify that a field is a 64 Bit hexadecimal MAC address $mac =~ ^[A-Fa-f0-9]{16}$ Gets the job done. How else, but a regular expression so concisely? And, when you say, "If I want to validate input data with the machine I just use a parser." - that's pretty much what a regex engine is - a sophisticated parser, and the regular expression is the "commands" that you feed to it to parse the input text.
- ghshephard 13y agoHere is another one I just did tonight - I wanted to match IPv4 addresses, but didn't want to validate anything with a leading 0 (specifies octal format, which 99.9999% of the time is not what people want), but I do want to accept a leading 0 if it's the only value (I.E. 3.0.2.1, 0.0.0.0, etc...) regex_ipv4='^((25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9][0-9]|[0-9])$' Gets the job done. How else would you do it? You can then build up a library of these, and use them on other projects.
- mattyod 13y agoI like it. Would be nice to be able to match against multiple test strings though.
- hclee 13y agoNot bad. You don't have to jump around your regexp reference and editor. It does not exactly tell you why your exp & string does not match. It just show what typed reg exp will do.
- Lindrian 13y agoI think this shows quite clearly what is going on and why I get the result I get: http://regex101.com/r/kU3cJ6/#debugger http://regex101.com/r/kU3cJ6/#debugger (imgur link: http://imgur.com/H2IkNGy http://imgur.com/H2IkNGy) If you don't agree with me, could you perhaps suggest an improvement?
- hclee 13y agoI mean it does its job and it is good. I would use it. But look at this case; test string inout [123:0] Asdfg Exp (made it wrong in purpose) ^inout\s+\[[0-9]\: It just display "No Matches". It would be cool if it kind of guide what exp you want to use to match test string. What you put in Test string is what you want to get.
- thousande 13y agoThe explanation box is nice! Here is another regex tester: http://www.gethifi.com/tools/regex http://www.gethifi.com/tools/regex
- shocks 13y agoLots of great information in this thread, thanks all!
- shmerl 13y agoHow do you replay the tutorial once it's finished?