isnumeric

问题 I run a macro that copies tables from a PDF file and saves them on Excel. some of the tables contain empty cells and in my analysis I need to know the number of cells that are empty. I have a function that iterates through each column to check if the value within that cell is numeric or not. the trouble is when I run this function on an empty cell it returns true. I even tried manually cheeking the cells using the Isblank() function and it returns "false". (if I try this on any cell outside

问题 I'm porting a small snippet of PHP code to java right now, and I was relying on the function is_numeric($x) to determine if $x is a number or not. There doesn't seem to be an equivalent function in java, and I'm not satisfied with the current solutions I've found so far. I'm leaning toward the regular expression solution found here: http://rosettacode.org/wiki/Determine_if_a_string_is_numeric Which method should I use and why? 回答1: Note that the PHP isNumeric() function will correctly

问题 Hello I seemed to be failing my code: if (!empty($_POST['id'])) { echo "empty"; } else { if (is_numeric($_POST['id'])) { echo "numeric!"; } else { echo "not empty but not numeric how come?"; } } My browser url: hxxp://localhost/upload/?id=9 OUTPUT: not numeric how come? please help. 回答1: should use if(is_numeric($_GET['id'])) { if (is_numeric($_GET['id'])) { echo "yes numeric"; } else { echo "not numeric"; } 回答2: first: if (!empty($_POST['id'])) { echo "empty"; } else ... You are saying: If

问题 Is there a way to check if string is numeric. {#strings.isNumeric(dataField)} doesn't work. How can I check if string contains numbers (specific number of digits as well) - is there a RegEx that can be used, or an inbuilt function that can be called? Want to avoid this below: {#string.contains('1') or #string.contains('2')} 回答1: Try matches() : {#dataField.matches('[0-9]{3,8}')} This matches a string that is from 3 to 8 digits long (inclusive). You can change those values to whatever works

问题 Is there a way to check if string is numeric. {#strings.isNumeric(dataField)} doesn't work. How can I check if string contains numbers (specific number of digits as well) - is there a RegEx that can be used, or an inbuilt function that can be called? Want to avoid this below: {#string.contains('1') or #string.contains('2')} 回答1: Try matches() : {#dataField.matches('[0-9]{3,8}')} This matches a string that is from 3 to 8 digits long (inclusive). You can change those values to whatever works

问题 Is there a way to check if string is numeric. {#strings.isNumeric(dataField)} doesn't work. How can I check if string contains numbers (specific number of digits as well) - is there a RegEx that can be used, or an inbuilt function that can be called? Want to avoid this below: {#string.contains('1') or #string.contains('2')} 回答1: Try matches() : {#dataField.matches('[0-9]{3,8}')} This matches a string that is from 3 to 8 digits long (inclusive). You can change those values to whatever works

问题 I am working on a program for my Visual Basic class and have a quick question. One of the things we were encouraged to do was to check to make sure the quantity entered in a text box is actually a number. Our professor suggested using IsNumeric to perform this check, but I'm running into some trouble. I already had a good bit of the code written before he added this to the instructions, so not sure how to integrate this into the code I already have. The main purpose of the program is to allow

问题 I am having issues with sqlserver's ISNUMERIC function where it is returning true for ',' I am parsing a postal code and trying to see if the second char (supposed to be a digit) is a 0 or not and do something different in each case. The issue is that I can't just cast the char by checking isNumeric first. Here is the code for my scalar-valued function to return the digit in the second char location, and -1 if it is not a digit. @declare firstDigit int IF ISNUMERIC(SUBSTRING(@postal,2,1) AS

问题 Here's an example query: DECLARE @table table (loc varchar(10)) INSERT INTO @table VALUES ('134a'), ('123'), ('abc'), ('124') SELECT * FROM ( SELECT * FROM @table WHERE ISNUMERIC(loc) = 1 ) as a WHERE CAST(loc as INT) BETWEEN 100 AND 200 If I have some varchar values and I limit them to numeric values using ISNUMERIC in a derived table in the query, why does it result in a conversion error?: Conversion failed when converting the varchar value '134a' to data type int. Is there a way around

问题 I need to find out if a string is numeric in dart. It needs to return true on any valid number type in dart. So far, my solution is bool isNumeric(String str) { try{ var value = double.parse(str); } on FormatException { return false; } finally { return true; } } Is there a native way to do this? If not, is there a better way to do it? 回答1: This can be simpliefied a bit void main(args) { print(isNumeric(null)); print(isNumeric('')); print(isNumeric('x')); print(isNumeric('123x')); print