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Is there a regular expression to detect a valid regular expression?

... / ^ # start of string ( # first group start (?: (?:[^?+*{}()[\]\\|]+ # literals and ^, $ | \\. # escaped characters | \[ (?:...
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JSON datetime between Python and JavaScript

...e this functionality... so you should make sure to append that info on the string before returning – Nick Franceschina Aug 24 '10 at 0:27 3 ...
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How to use string.replace() in python 3.x

The string.replace() is deprecated on python 3.x. What is the new way of doing this? 8 Answers ...
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How do I remove all HTML tags from a string without knowing which tags are in it?

...there any easy way to remove all HTML tags or ANYTHING HTML related from a string? 3 Answers ...
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How to get parameters from a URL string?

I have a HTML form field $_POST["url"] having some URL strings as the value. Example values are: 13 Answers ...
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Difference between == and ===

...ook at example: class Person : Equatable { let ssn: Int let name: String init(ssn: Int, name: String) { self.ssn = ssn self.name = name } static func == (lhs: Person, rhs: Person) -> Bool { return lhs.ssn == rhs.ssn } } P.S.: Since ssn(social s...
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Pad a number with leading zeros in JavaScript [duplicate]

... or at least not completely; it treats them as if their value is the empty string. Thus you get a copy of the zero character (or whatever "z" is) between each of the array elements; that's why there's a + 1 in there. Example usage: pad(10, 4); // 0010 pad(9, 4); // 0009 pad(123, 4); ...
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android.content.res.Resources$NotFoundException: String resource ID #0x0

... Change dateTime.setText(app.getTotalDl()); To dateTime.setText(String.valueOf(app.getTotalDl())); There are different versions of setText - one takes a String and one takes an int resource id. If you pass it an integer it will try to look for the corresponding string resource id - whic...
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Enforcing spaces in string resources [duplicate]

In an Android string resource, how do I enforce a space? 3 Answers 3 ...
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What does the 'u' symbol mean in front of string values? [duplicate]

... The 'u' in front of the string values means the string is a Unicode string. Unicode is a way to represent more characters than normal ASCII can manage. The fact that you're seeing the u means you're on Python 2 - strings are Unicode by default on Py...