Regex Tester and generator. Please input test string. Test regex Generate code. Replace with:. Common Regular Expressions.
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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I checked on the stackExchange description, and algorithm questions are one of the allowed topics. So here goes. Given an input of a range, where begin and ending numbers have the same number of digits say, 2, 3, or 4I want to write code to generate a set of regular expressions which, when checked against a number in turn, tell me whether that number is in the original range.
For example: if the range isthen, and would all match one of the regular expressions generated, andused to sayand used to say would not. Am I missing something? There are details even in the above that I'm glossing over, it seems like something that would benefit from an algorithmic sword slashing through the details. But the other things I've come up with are even messier than this.
Here's my solution and an algorithm with complexity O log n n is the end of the range. I believe it is the simplest one here:. By "weaken", I mean finding the end of range that can be represented by simple regex for this specific number, for example:.
The rest is technical details and is easy to implement. Oh, and by the way, it works with other ranges too, for example for range the result is:. I've finally arrived at the following. The overall idea is to start with the beginning of the range, produce a regular expression that will match from that up to but not including the next multiple of 10, then for hundreds, etc.
Then generate one regular expression for the part of the range if they don't already cover it all. Special note should be taken of bezmax's routine to convert two numbers to the regular expression that will match them - MUCH easier than dealing with strings or character arrays directly, I think.
This one is correct as far as I've been able to test it; the one posted by bezmax did not quite work, though he had the right idea that I also came up with for an overall algorithm, and a major implementation detail or two that were helpful, so I'm leaving the 'answer' checkmark on his response.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I searched a lot and can't find the solution for this RegExp I have to say I'm not very experienced in Reg. As mu is too short said, using an integer comparison would be a lot easier, and more efficient.
Here's an example function:. But you only need to do:. If there is an efficiency advantage not that this task is likely to be a major resource drain -- unless you are doing thousands of these evaluations in my pattern, it will come down to the fact that there are no redundant checks in the pattern. It may not make any difference to the regex engine, but I've ordered my branches based on the ones that take the least "effort" to evaluate instead of the natural sequence of numbers.
Harpo's pattern is as brief as the pattern can be built, but  are first-digit matches that are satisfied by the multiple branches.Ord 163 din 2007
MichaelHoffmann's and jonschlinkert's patterns are not correct because they fail to distribute the necessary anchors to each branch. Learn more.Paracord knife knots
RegExp range of number 1 to 36 Ask Question. Asked 8 years, 11 months ago. Active 9 months ago.
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Viewed 42k times. I would like to test a number between 1 and 36, excluding 0 and 37 and above. What I've got so far and almost works it doesn't accept 17, 18, 19, 27, 28, Active Oldest Votes. I see pass for all values. Michael Hoffmann Michael Hoffmann 1, 1 1 gold badge 17 17 silver badges 35 35 bronze badges.Vuetify data table default sort
Purely for academic reasons, I'll add a unique and accurate pattern. MichaelHoffmann Please read my answer to understand why your pattern is incorrect. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta.My past life story
Community and Moderator guidelines for escalating issues via new response…. Feedback on Q2 Community Roadmap. Triage needs to be fixed urgently, and users need to be notified upon…. Technical site integration observational experiment live on Stack Overflow. Dark Mode Beta - help us root out low-contrast and un-converted bits.How can i define regular expression for string range e. Thi sis bordering on what you should check with a regex.
By continuing to browse this site, you agree to this use. Learn more. The content you requested has been removed. Ask a question. Quick access. Search related threads. Remove From My Forums. Answered by:. Archived Forums N-R. Regular Expressions. NET Framework. Sign in to vote. Hi, How can i define regular expression for string range e. Anyway of doing it through regular expression?
This has three alternatives: one for single- and two-digit numbers allowing leading zeroeswhere each digit can be anything from 0 to 9. And another one that specifies what range of digits is allowed for each digit in a three-digit number. In this case, this means that the first digit needs to be 1, the second between 0 and 7 and the last one may be anything. The third alternative is just for the number which didn't fit nicely into the pattern elsewhere.
I don't think regex is the right choice for this. Have you tried parsing the value? The recently released rgxg command line tool generates regular expressions that match a specific number range:.
If you need the two digit range, it's just a matter of adding  to the regex. Also, if you are having trouble working with regex, try to specify them in a manner that makes the regex operators as clear as possible - usually there's a way to represent them in a way that makes their function much more clear, specially if the language you are doing this in allows you to separate portions of the regex specification into separate columns and lines.
Using regular expressions to validate a numeric range
Learn more. Regular Expression: Numeric range Ask Question. Asked 10 years, 7 months ago. Active 9 months ago. Viewed 53k times. How do you write a regular expression that matches a numeric range from 0 or to ? Morten Morten 1, 5 5 gold badges 23 23 silver badges 35 35 bronze badges. It already support negative values. The current code is not updated, so you'll have to download it from that github resource.
Active Oldest Votes. Joey Joey k 74 74 gold badges silver badges bronze badges. This does the trick. As you also mentioned it has to match 3 digit numbers as, and so on which this does. Thank you! Two bugs even : but yes, I fundamentally agree. Well, in that case capture each individual part of the coordinate in a capture group and validate them afterwards.
This is the right answer in my opinion. People who try to solve these thing with pure REs are doing themselves and the people that come after them a disservice.
PowerShell helps for validating: Gumbo Gumbo k 95 95 gold badges silver badges bronze badges. Ionut G. You forgot single digit 1 to 9.In addition, since regular expressions analyze strings, numbers must first be translated to a string before they can be tested an exception is when the number happens to already be a string, such as when getting user input from the console.
To ensure the string is a number to begin with, you could use org. NumberUtils isNumber s. Despite this, figuring out how to validate number ranges with regular expressions is interesting and instructive. Word boundaries are necessary to avoid matching the 15 inside of The rule: The number must be between 15 and Three possible regexes:. Making this work for both negative and positive is as simple as adding an optional dash at the start:. Leaving the lookbehind out would cause the 11 in to match.
The first example in this post should have this added. For example. With thanks to TimPietzcker at stackoverflow. This is from a question on stackoverflow.
Here is a visual representation of this regex Try it out yourself :. With thanks to PlasmaPower and Casimir et Hippolyte on stackoverflow for the debugging assistance. Depending on what you are capturingit is likely that all sub-groups should be made into non-capture groups. For example, this:. Try again. Enter a number between and Not in range.
Enter a number between and Number: You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email.Regular expressions may have extensive functionality, but they are designed to match text, so matching a numeric range requires some extra work. Since the need to match numeric ranges is sometimes necessary, RegExPlus has built-in support for handling them.
If you allow leading zeros, you can specify how many digits the match will be that is, the match's width. A range can be specified as either [ start. Negative numbers are supported, as well as ranges specified in a different base. When allowing leading zerosthere is a way to specify the number of digits in a valid match. For example, the range Whereas, the range In general, the number of digits for a valid match must be between the number of digits in start and in end.
If one of the bounds is positive and one of the bounds is negative, the match's width is as follows. For the negative numbers, the number of digits must be between 1 and 2.Airedale - uk
For the positive numbers, the number of digits must be between 1 and 3. For the negative numbers, the number of digits must be either 1 or 2. The other way to match a numeric range has no leading zeros as part of the match.
The syntax to do this is? The linked tutorial on numeric ranges has several common ranges. The below examples show how to match them using the numeric range syntax. Below are some examples of common ranges and how to match them using the numeric range syntax. Y - matches a number between X and Y, leading zeros are optional. Type 2 : 00X. Y - matches a number between X and Y, requiring the number to be a specific width. Type 3 : X. Y - matches a number between X and Y, leading zeros are not allowed.
Included in the Pattern class are static functions able to output a regular expression for the inputted range. The returned value is wrapped in a non-capture group to allow easy integration. For most needs, the range you specify will be in base For example, to match an IPv4 address in dot-decimal notation, you would use the range However, let's say you wanted to match an IPv4 address in dotted hexadecimal notation.Om606 problems
For each part, you would match the hexadecimal numbers in the range The syntax for the regex to match this range is? Z 16 [ FF] to allow leading zeros and?
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