regex-negation

问题 This question already has an answer here : .NET Regex Negative Lookahead - what am I doing wrong? (1 answer) Closed 3 years ago . I asked this previously and used what I believe to be entirely too simple of a construct, so I'm trying again... Assuming that I have: This is a random bit of information from 0 to 1. This is a non-random bit of information I do NOT want to match This is the end of this bit This is a random bit of information from 0 to 1. This is a non-random bit of information I

问题 I have condition where I have to select anything which is not part of span tag. Input - the <span class='ptc-highlightedSearchResult'>PISTON</span> has their <span class='ptc-highlightedSearchResult'>ROD</span> ring regex which selects <span> tag and it's content - (<span[^>]+class\s*=\s*("|')ptc-highlightedSearchResult\2[^>]*>)[^<]*(</span>) I'm able to select whatever comes in span and their content but not otherwise. Any help on NOT operation will be appreciated. 回答1: You can use this: ((?

问题 Let's suppose that we have such HTML code. We need to get all <a href=""></a> tags which DO NOT contain img tag inside it. <a href="http://domain1.com"><span>Here is link</span></a> <a href="http://domain2.com" title="">Hello</a> <a href="http://domain3.com" title=""><img src="" /></a> <a href="http://domain4" title=""> I'm the image <img src="" /> yeah</a> I'm using this regular expression to find all the a tag links: preg_match_all("!<a[^>]+href=\"?'?([^ \"'>]+)\"?'?[^>]*>(.*?)</a>!is",

问题 I need to match ["this" but not :["this" I have this code: Match match = Regex.Match(result, @"\[""(.*?)""", RegexOptions.IgnoreCase); while (match.Success) { MessageBox.Show(match.Groups[1].Value.Trim()); } I have tried the pattern @"(?!:)\[""(.*?)""" , but it still match :["this" . Whats the pattern I need to achieve this? 回答1: You are looking ahead (rightwards in the string) when you want to be looking behind (leftwards in the string). Try @"(?<!:)\[""(.*?)""" instead. 回答2: I used

问题 There are many questions already answered for replacing everything positive numbers. But, I couldn't find any answer which preserves both positive and negative numbers. I want to replace everything that isn't number(positive or negative). The output should be the following eg. 0 | success. id - 1234| -> 0 1234 and -10 | failure. id - 2345| -> -10 2345 Apparently this answers for the positive part. 回答1: You can use this regex to match positive/negative integers: [+-]?\b\d+\b RegEx Demo to

问题 This is my current regex check: const validPassword = (password) => password.match(/^(?=.*\d)(?=.\S)(?=.*[a-zA-Z]).{6,}$/); I have a check for at least 1 letter and 1 number and at least 6 characters long. However I also want to make sure that there are no spaces anywhere in the string. So far I'm able to enter in 6 character strings with spaces included :( Found this answer here, but for some reason in my code it's passing. What is the regular expression for matching that contains no white

问题 I'm attempting this challenge: https://regex.alf.nu/4 I want to match all strings that don't contain an ABBA pattern. Match: aesthophysiology amphimictical baruria calomorphic Don't Match anallagmatic bassarisk chorioallantois coccomyces abba Firstly, I have a regex to determine the ABBA pattern. (\w)(\w)\2\1 Next I want to match strings that don't contain that pattern: ^((?!(\w)(\w)\2\1).)*$ However this matches everything. If I simplify this by specifying a literal for the negative

问题 I work on R, and I will want to extract all HTML tag closed from a PlainTextDocument. I use a gsub method with a regex : gsub("<?!([^<]/*)>"," ",fm,perl=TRUE,ignore.case=TRUE) But, the slash '/' isn't evaluated. I think I wasn't very clear. Here is what I need to do : I have a text (a HTML document) and I want to only keep the tags ( <> and </> ). I thought using gsub would be a good idea, but maybe you have a better solution. 回答1: The wording of your question is unclear, and your regex doesn

问题 Consider this text: ... bedeubedeu France The Provençal name for tripe bee balmbee balm Bergamot beechmastbeechmast Beech nut beech nutbeech nut A small nut from the beech tree, genus Fagus and Nothofagus, similar in flavour to a hazelnut but not commonly used. A flavoursome oil can be extracted from them. Also called beechmast beechwheatbeechwheat Buckwheat beefbeef The meat of the animal known as a cow (female) or bull (male) (NOTE: The Anglo- saxon name ‘Ox’ is still used for some of what

问题 What is a regex to match a string that ends with a number for example "c1234" - match "c12" - match "c" - no match Tried this but it doesn't work (?|c(?|[0-9]*$)) Thanks again, The beggining string needs to be specific too 回答1: Just use \d$ to check your string ends with a digit If you want your string to be a "c" followed by some digits, use c\d+$ 回答2: To match any string ending with a digit use: [\s\S]*\d$ if (preg_match('/[\s\S]*\d$/', $value)) { #match } else { #no match } 回答3: You can