parentheses

问题 I'm just wondering how I could remove the text between a set of parentheses and the parentheses themselves in php. Example : ABC (Test1) I would like it to delete (Test1) and only leave ABC Thanks 回答1: $string = "ABC (Test1)"; echo preg_replace("/\([^)]+\)/","",$string); // 'ABC ' preg_replace is a perl-based regular expression replace routine. What this script does is matches all occurrences of a opening parenthesis, followed by any number of characters not a closing parenthesis, and again

问题 What is the formal difference between passing arguments to functions in parentheses () and in braces {} ? The feeling I got from the Programming in Scala book is that Scala's pretty flexible and I should use the one I like best, but I find that some cases compile while others don't. For instance (just meant as an example; I would appreciate any response that discusses the general case, not this particular example only): val tupleList = List[(String, String)]() val filtered = tupleList

问题 code_0: (calling foo without parentheses) function foo(){ console.log('hello world'); } setTimeout(foo, 2000); This is how code_0 was executed: start -> wait for 2 seconds -> 'hello world' displayed -> end code_1: (calling foo with parentheses) function foo(){ console.log('hello world'); } setTimeout(foo(), 2000); And this is how code_1 was executed: start -> 'hello world' displayed immediately -> wait for 2 seconds -> end Why would the program perform so differently when I called the

问题 code_0: (calling foo without parentheses) function foo(){ console.log('hello world'); } setTimeout(foo, 2000); This is how code_0 was executed: start -> wait for 2 seconds -> 'hello world' displayed -> end code_1: (calling foo with parentheses) function foo(){ console.log('hello world'); } setTimeout(foo(), 2000); And this is how code_1 was executed: start -> 'hello world' displayed immediately -> wait for 2 seconds -> end Why would the program perform so differently when I called the

问题 Recently i've read 'Databinding overview' article at MSDN and there is such sample code: <TextBox.ToolTip> <Binding RelativeSource="{RelativeSource Self}" Path="(Validation.Errors)[0].ErrorContent"/> </TextBox.ToolTip> I know that {} means markup extensions but what mean () parentheses here? It would be nice someone share link to explanation such syntax. Thanks! Path="(Validation.Errors)[0].ErrorContent" 回答1: The () parentheses refer to Attached Properties. Binding to an Attached Property 回答2

问题 Recently i've read 'Databinding overview' article at MSDN and there is such sample code: <TextBox.ToolTip> <Binding RelativeSource="{RelativeSource Self}" Path="(Validation.Errors)[0].ErrorContent"/> </TextBox.ToolTip> I know that {} means markup extensions but what mean () parentheses here? It would be nice someone share link to explanation such syntax. Thanks! Path="(Validation.Errors)[0].ErrorContent" 回答1: The () parentheses refer to Attached Properties. Binding to an Attached Property 回答2

问题 I always use brackets in sql queries. But I have example: DELETE FROM prog WHERE prog_start >= $1 AND prog_start < $2 OR prog_end > $1 AND prog_end <= $2 Is it equal to : DELETE FROM prog WHERE ( prog_start >= $1 AND prog_start < $2 ) OR ( prog_end > $1 AND prog_end <= $2 ) or not ? 回答1: In SQL the AND operator takes "precedence" over OR operator. PostgreSQL adheres to the spec here. You can the exact precedence in PostgreSQL in the docs Lexical Structure: Operator Precedence. So in your case

问题 Closed . This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 4 years ago . Just your personal preference, which do you prefer? if filename in filesAndFoldersList: while a != "TEST": a = input("Input: ") Or if(filename in filesAndFoldersList): while(a != "TEST"): a = input("Input: ") Either one works, so this is just personal preference I think.

问题 I have a problem with a dynamic list in Excel 2003 where some cells that I want to be empty are returning #NUM! . I have tried manipulating the following code, but to no avail: =IF(ISERROR(INDEX(venue_name, SMALL(IF(($A$10=date_ns)*(COUNTIF($A$13:A29,venue_name)=0), ROW(date_ns)-MIN(ROW(date_ns))+1, ""), 1))) I know its something to do with syntax/parentheses but have exhausted myself trying different combinations. Without the IF(ISERROR( and the closing bracket, the code runs absolutely fine

问题 Given a syntactically valid, but otherwise arbitrary, Julia expression, such as 3 - 4 > 1 & 2 + 2 == 4 | 10 - 5 > 2 or 2 + 9 - 8 * 8 ^ 7 / 2 == 8 + 8 / 1 ^ 2 ...is there a convenient way to fully parenthesize the expression in a way consistent with Julia's standard parsing of it? One approach that won't go far enough: julia> parse("3 - 4 > 1 & 2+2 == 4 | 10 - 5 > 2") :(3 - 4 > 1 & 2 + 2 == (4 | 10) - 5 > 2) julia> parse("2 + 9 - 8 * 8 ^ 7 / 2 == 8 + 8 / 1 ^ 2") :((2 + 9) - (8 * 8^7) / 2 == 8