Regular expression to match words which does not start with particular charector in python using negative lookahead assertion [duplicate]

Multi tool use
Multi tool use


Regular expression to match words which does not start with particular charector in python using negative lookahead assertion [duplicate]



This question already has an answer here:



In the string


s = 'Makeupby Antonia #makeup #makeupartist #makeupdolls #abhcosmetics'



I want to match only word which does not start with #. Means I want to select only Makeupby and Antonia
I tried using negative lookahead assertion


#


Makeupby


Antonia


re.findall(r'b(?![#])[a-zA-Z]+',s)

['Makeupby',
'Antonia',
'makeup',
'makeupartist',
'makeupdolls',
'abhcosmetics']



But this is matching with all words. Where I am wrong?



This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.




1 Answer
1



(?!) is syntax for a negative lookahead. You want a negative lookbehind.


(?!)



try b(?<!#)[a-zA-Z]+


b(?<!#)[a-zA-Z]+



Demo

3j8boS,ru4ITClG,HqYUfLuUXODG HrQi,6tUwKf7eQths8,m q 4g79K
-
lgIuLGUsOHV1NudmybL BaIF rVPX,aRQQpSdwNMDMw6bj,IwdSY zDWA zt,xPPul0iW

Popular posts from this blog

PHP contact form sending but not receiving emails

PHP contact form sending but not receiving emails I have created a contact form using PHP to send the data. The form seems to send fine as there are no errors and success message appears, however I am not receving the emails into the designated inbox. I am using PHPMailer as I originally tried just using the php 'mail' command which I now understand is a bit hit and miss. I cannot see why I would not be receving the emails so I would be very grateful for any help that could be given. I'm quite new to PHP so please be patient with me :) <?php use PHPMailerPHPMailerPHPMailer; use PHPMailerPHPMailerException; $msg = ""; if (isset($_POST['submit'])) { require 'phpmailer/src/Exception.php'; require 'phpmailer/src/PHPMailer.php'; require 'phpmailer/src/SMTP.php'; function sendemail ($to, $from, $body) { $mail = new PHPMailer(true); $mail->setFrom($from); $mail->addAddress($to); $ma...
Read more

Do graphics cards have individual ID by which single devices can be distinguished?

Do graphics cards have individual ID by which single devices can be distinguished? I have several graphics cards of the same manufacturer and same model and I want to distinguish them not only by the pcie socket they reside in but by some individual value I can read from the hardware. Is there such value and if so what would it be called and how could I access it? Right now I'm using modern nvidia cards (10xx series) and nvidia inspector.but I'd prefer if there was any value that was also applicable to amd. I have programming and scripting knowledge. I am running Windows 10 1 Answer 1 This is a powershell example to pull information from video cards. The DeviceID is supposed to be unique but only if the manufacturer supports Windows Display Driver Model (WDDM). (I copied this directly from docs.microsoft.com) $strComputer = "." $colItems = get-wmiobject -class "Win32_VideoC...
Read more

Create weekly swift ios local notifications

Create weekly swift ios local notifications I can create daily notifications but not weekly ones using swift 3 ios 10 User Notifications framework. Daily works fine but when I add in the .weekday parameter it doesn't send me a notification. The code is: for i in 1 ... 7 { let center = UNUserNotificationCenter.current(); let content = UNMutableNotificationContent(); content.title = "Title"; content.body = "content"; content.sound = UNNotificationSound.default(); var dateComponents = DateComponents(); dateComponents.weekday = i; // hours is 00 to 11 in string format if (daynight == "am") { dateComponents.hour = Int(hours); } else { dateComponents.hour = Int(hours)! + 12; } // mins is 00 to 59 in string format dateCom...
Read more