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Reference - What does this regex mean?

What is this? This is a collection of common Q&A. This is also a Community Wiki, so everyone is invited to participate in maintaining it.

How to do ray tracing in modern OpenGL?

So I'm at a point that I should begin lighting my flatly colored models. The test application is a test case for the implementation of only latest methods so I

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I'm trying to convert ROS Image to stream(not video format eg.mp4) and send it to the Janus webrtc server with python. The reason why I need stream is the param

How to Access RDS Proxy from a Different AWS Region?

I have a RDS database and a RDS proxy in one region. However, I also have a lambda function in a different region that need to connect to the RDS proxy in the f

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So, this is my code: .headline { font-size: 61px; font-family: 'Gotham Pro Medium', sans-serif; /* font-weight: 700; */ color: rgb(81, 83, 74); te

How to add toAlternatingCase custom method to String class in JavaScript?

I'm trying to add a custom method to the String class in JavaScript called toAlternatingCase, it will turn lowercase characters into uppercase and vice versa in

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Extracting values from XML column in Oracle PLSQL

SELECT x.xml_data.getClobVal() FROM test_xml x; Results of above query is: <CstmrCdtTrfInitn> <GrpHdr> <MsgId>191189 </MsgId> &l

T-SQL Convert Hex to decimal

I try to use TSQL and I get some problem to convert hex to decimal when the value is inside a variable. My code is: SET @hex = SUBSTRING(@x,1,2) --give 1e SET

Is there any way to get public water quality data in US

I'm trying to develop an application that can show water quality data from other country. Is there any api or service to get realtime public water quality data