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Sanitizing strings to make them URL and filename safe?

I am trying to come up with a function that does a good job of sanitizing certain strings so that they are safe to use in the URL (like a post slug) and also safe to use as file names. For example, when someone uploads a file I want to make sure that I remove all dangerous characters from the name. ...
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Can I have an IF block in DOS batch file?

In a DOS batch file we can only have 1 line if statement body? I think I found somewhere that I could use () for an if block just like the {} used in C-like programming languages, but it is not executing the statements when I try this. No error message either. This my code: ...
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Having options in argparse with a dash

I want to have some options in argparse module such as --pm-export however when I try to use it like args.pm-export I get the error that there is not attribute pm . How can I get around this issue? Is it possible to have - in command line options? ...
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SVG get text element width

I'm working on some ECMAScript/JavaScript for an SVG file and need to get the width and height of a text element so I can resize a rectangle that surrounds it. In HTML I would be able to use the offsetWidth and offsetHeight attributes on the element but it appears that those properties are...
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How can you find and replace text in a file using the Windows command-line environment?

I am writing a batch file script using Windows command-line environment and want to change each occurrence of some text in a file (ex. "FOO") with another (ex. "BAR"). What is the simplest way to do that? Any built in functions? ...
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Easy way to test a URL for 404 in PHP?

...d I've found that sometimes the URL's that I feed into my code return 404, which gums up all the rest of my code. 15 Answer...
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How do you access the matched groups in a JavaScript regular expression?

I want to match a portion of a string using a regular expression and then access that parenthesized substring: 22 Answers...
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What is the difference between task and thread?

In C# 4.0, we have Task in the System.Threading.Tasks namespace. What is the true difference between Thread and Task . I did some sample program(help taken from MSDN) for my own sake of learning with ...
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undefined reference to `WinMain@16'

When I try to build a program using Eclipse CDT , I get the following: 6 Answers 6 ...
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Undefined, unspecified and implementation-defined behavior

What is undefined behavior in C and C++? What about unspecified behavior and implementation-defined behavior? What is the difference between them? ...