isnumeric

how to do this simple check in JSTL(without extending any java classes and additional JSP functions). I need it like this: <c:if test="${fn:isNumeric()}"> ... do something ... </c:if> Thanks in advance. If your environment supports the new EL 2.2 feature of invoking non-getter methods on EL objects (which is available in all Servlet 3.0 compatible containers, such as Tomcat 7, Glassfish 3, etc), then you could just use the String#matches() method directly in EL. <c:set var="numberAsString">${someExpressionToTestForNumber}</c:set> <c:if test="${numberAsString.matches('[0-9]+')}"> It's a number!

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? Jacob Mattison Note that the PHP isNumeric() function will correctly determine that hex and scientific notation are numbers, which the regex approach you link to will

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? This can be simpliefied a bit void main(args) { print(isNumeric(null)); print(isNumeric('')); print(isNumeric('x')); print(isNumeric('123x')); print(isNumeric('123')); print(isNumeric('+123')); print(isNumeric('123.456')); print(isNumeric('1,234.567')); print

During some projects I have needed to validate some data and be as certain as possible that it is javascript numerical value that can be used in mathematical operations. jQuery, and some other javascript libraries already include such a function, usually called isNumeric. There is also a post on stackoverflow that has been widely accepted as the answer, the same general routine that the fore mentioned libraries are using. function isNumber(n) { return !isNaN(parseFloat(n)) && isFinite(n); } Being my first post, I was unable to reply in that thread. The issue that I had with the accepted post

I have a function in VB.NET that loops through values and attempts to convert it to a decimal if IsNumeric is True, Dim Value As String If IsNumeric(Value) = True Then Rate = CType(Value, Decimal) <--- bombing here End If I've found that when the function receives the value 603E43 IsNumeric evaluates to True for some reason and then bombs on the conversion. Why would IsNumeric be true in this case? See http://support.microsoft.com/kb/329488 IsNumeric returns true if it can be converted to a double which is true for 603E43 The value is however larger than what a decimal can hold You could use

I need to find the highest value from the database that satisfies a certain formatting convention. Specifically, I would like to find the highest value that looks like EU999999 ('9' being any digit) select max(col) will return something like 'EUZ...' for instance that I want to exclude. The following query does the trick, but I can't produce this via Linq-to-SQL. There seems to be no translation for the isnumeric() function in SQL Server. select max(col) from table where col like 'EU%' and 1=isnumeric(replace(col, 'EU', '')) Writing a database function, stored procedure, or anything else of

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 int) = 1 set @firstDigit = CAST(SUBSTRING(@postal,2,1) AS int) ELSE set @firstDigit = -1 RETURN