First of all, I assume that you know that 6.2f * 10 is not exactly 62 due to floating point rounding (it’s actually the value 61.99999809265137 when expressed as a double) and that your question is only about why two seemingly identical computations result in the wrong value. The answer is that in the case … Read more
Ooh, it’s not easy at all. Func<T> represents a generic delegate and not an expression. If there’s any way you could do so (due to optimizations and other things done by the compiler, some data might be thrown away, so it might be impossible to get the original expression back), it’d be disassembling the IL … Read more
The assignment expression operator := added in Python 3.8 supports assignment inside of lambda expressions. This operator can only appear within a parenthesized (…), bracketed […], or braced {…} expression for syntactic reasons. For example, we will be able to write the following: import sys say_hello = lambda: ( message := “Hello world”, sys.stdout.write(message + … Read more
Square brackets are meant for character class, and you’re actually trying to match any one of: s, |, s (again), e, a, s (again), o and n. Use parentheses instead for grouping: (s|season) or non-capturing group: (?:s|season) Note: Non-capture groups tell the engine that it doesn’t need to store the match, while the other one … Read more
Deep insights appreciated. I shall do my best. As other answers have noted, what’s going on here is the compiler is detecting that an expression is being used as a statement. In many languages — C, JavaScript, and many others — it is perfectly legal to use an expression as a statement. 2 + 2; … Read more
Extending @KooiInc answer, you can avoid manually escaping every special character by using the source property of the RegExp object. Example: var urlRegex= new RegExp(” + /(?:(?:(https?|ftp):)?\/\/)/.source // protocol + /(?:([^:\n\r]+):([^@\n\r]+)@)?/.source // user:pass + /(?:(?:www\.)?([^\/\n\r]+))/.source // domain + /(\/[^?\n\r]+)?/.source // request + /(\?[^#\n\r]*)?/.source // query + /(#?[^\n\r]*)?/.source // anchor ); or if you want to … Read more
In the expression (i, ++i, 1), the comma used is the comma operator the comma operator (represented by the token ,) is a binary operator that evaluates its first operand and discards the result, and then evaluates the second operand and returns this value (and type). Because it discards its first operand, it is generally … Read more
This expression will search for non-ASCII values: [^\x00-\x7F]+ Tick off ‘Search Mode = Regular expression’, and click Find Next. Source: Regex any ASCII character
Use a controller method if you need to run arbitrary JavaScript code, or you could define a filter that returned true or false. I just tested (should have done that first), and something like ng-show=”!a && b” worked as expected.
<xsl:if test=”xpath-expression”>…</xsl:if> so for example <xsl:if test=”/html/body”>body node exists</xsl:if> <xsl:if test=”not(/html/body)”>body node missing</xsl:if>