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Bookmark or Share- RegEx for matching "A-Z, a-z, 0-9, _" and "." - Stack Overflow^[A-Za-z0-9_.]+$ From beginning until the end of the string, match one or more of these characters. Edit: Note that ^ and $ match the beginning and the end of a line.
- What is the Java ?: operator called and what does it do?Others have answered this to reasonable extent, but often with the name "ternary operator". Being the pedant that I am, I'd like to make it clear that the name of the operator is the conditional operator or "conditional operator ?:".
- css selectors - CSS "and" and "or" - Stack OverflowVery old question I know, but since this is what came up on the top of my search results, I'll go ahead and answer it with modern day CSS.
- Logical operators ("and", "or") in DOS batch - Stack Overflow(1) Supported by the following points: The presence of the cmd and windows-console tags;; Prior experience of some people failing to recognise the very real difference between cmd and MS-DOS batch languages, and conflating DOC with the cmd terminal window;
- Difference between == and === in JavaScript - Stack OverflowThe above makes it sound as though a == comparison wouldn't check all the things in the first bullet point, "the same sequence of characters, same length, and same characters in corresponding positions" but in fact it does.
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