I have command output that has been stored in an array of strings, and this numerical value could or could not exist in a string, and if it does exit it can be any integer value. I've tried various methods with regex and parseInt, and I am not getting the desired effect, I believe because of the way the string is encoded. How have others gone about this in the past?
EDIT:
The issue is the string is coming back, encoded as UT8. So the initial string I get is this: disk: 40 Which I can reduce down to: 40 After that however, using a isNaN(decode_utf8(str)) Still produces a true for isNaN. I am not sure exactly how to overcome this
Try testing if a string is a number like this:
var toTest = "232";
if (!isNaN(+toTest)) {
var aNumber = +toTest
console.log('That is a number: ', aNumber)
if it must be a integer you could check like this:
// check if integer ...
var isInt = typeof aNumber === "number" && aNumber % 1 === 0;
}
If you are using latest JavaScript ES6 then isNumber is built in:
Number.isInteger(123) // true
Related
I created a simple code in Scala that checks whether an input is correctly formatted as HH:mm. I expect the code to result in an Array of valid strings. However, what I'm getting as a result is of type Any = Array(), which is problematic as when I try to print that result I get something like that:
[Ljava.lang.Object;#32a59591.
I guess it's a simple problem but being a Scala newbie I didn't manage to solve it even after a good few hours of googling and trial & error.
val scheduleHours = if (inputScheduleHours == "") {
dbutils.notebook.exit(s"ERROR: Missing param value for schedule hours.")
}
else {
val timePattern = """^((?:[0-30]?[0-9]|2[0-3]):[0-5][0-9])$""".r
val inputScheduleHoursParsed = inputScheduleHours.split(";").map(_.trim)
for (e <- inputScheduleHoursParsed) yield e match {
case timePattern(e) => e.toString
case _ => dbutils.notebook.exit(s"ERROR: Wrong param value for schedule hours: '${inputScheduleHours}'")
}
}
The problem is that some branches return the result you want and others return dbutils.notebook.exit which (I think) returns Unit. Scala must pick a type for the result that is compatible with both Unit and Array[String], and Any is the only one that fits.
One solution is to add a compatible value after the calls to dbutils.notebook.exit, e.g.
val scheduleHours = if (inputScheduleHours == "") {
dbutils.notebook.exit(s"ERROR: Missing param value for schedule hours.")
Array.empty[String]
}
Then all the branches return Array[String] so that will be the type of the result.
I want to ensure valid input on my text field where user can key in simple math expression for numbers up to 2 d.p such as "1.10 + 3.21 x 0.07". I am doing this through the adding regex to the input formatter constructor in the TextField class.
Following the regex example for 2 d.p here, I modified the code for my text field input formatter to include operators:
String dp = (decimalRange != null && decimalRange > 0)
? "([.][0-9]{0,$decimalRange}){0,1}"
: "";
String num = "($dp)|([0-9]{1,4}$dp)";
_exp = new RegExp(
"^($num){0,1}[-+x/]{0,1}($num){0,1}[-+x/]{0,1}($num){0,1}\$");
I am able to achieve "1.10 + 3.21 x 0.07", however, the user can also type invalid value into the textfield such as "1...10", "1.10 + 3..21". Any advice to improve the Regex above would be greatly appreciated!
Note that I also limit the user to key in a maximum of 3 decimal numbers. so "(2d.p)(operator)(2d.p)(operator)(2d.p)is the maximum limit.
This question already has answers here:
How to find sum of integers in a string using JavaScript
(3 answers)
Closed 3 years ago.
I am getting a string back "1+2" and would like to remove the "+" and then add the numbers together.
Is this possible using Regex? So far I have:
let matches = pattern.exec(this.expression);
matches.input.replace(/[^a-zA-Z ]/g, "")
I am now left with two numbers. How would I add together?
"this.a + this.b"
Assuming the string returned only has '+' operation how about:
const sum = str.split('+').reduce((sumSoFar, strNum) => sumSoFar + parseInt(strNum), 0);
You cannot add two numbers using regex.
If what you have is a string of the form "1+2", why not simply split the string on the + symbol, and parseInt the numbers before adding them?
var str = "1+2";
var parts = str.split("+"); //gives us ["1", "2"]
console.log(parseInt(parts[0]) + parseInt(parts[1]));
If you don't always know what the delimiter between the two numbers is going to be you could use regex to get your array of numbers, and then reduce or whatever from there.
var myString = '1+2 and 441 with 9978';
var result = myString.match(/\d+/g).reduce((a,n)=> a+parseInt(n),0);
console.log(result); // 1 + 2 + 441 + 9978 = 10422
*Edit: If you actually want to parse the math operation contained in the string, there are a couple of options. First, if the string is from a trusted source, you could use a Function constructor. But this can be almost as dangerous as using eval, so it should be used with great caution. You should NEVER use this if you are dealing with a string entered by a user through the web page.
var myFormula = '1+2 * 441 - 9978';
var fn = new Function('return ' + myFormula);
var output = fn();
console.log(myFormula, ' = ', output); //1+2 * 441 - 9978 = -9095
A safer (but more difficult) course would be to write your own math parser which would detect math symbols and numbers, but would prevent someone from injecting other random commands that could affect global scope variables and such.
I have an excel sheet where i use the follwoing command to get numbers from a cell that contains a form text:
=MID(D2;SEARCH("number";D2)+6;13)
It searches for the string "number" and gets the next 13 characters that comes after it. But some times the results get more than the number due to the fact these texts within the cells do not have a pattern, like the example below:
62999999990
21999999990
11999999990
6299999993) (
17999999999)
21914714753)
58741236714 P
18888888820
How do i avoid taking anything but numbers OR how do i remove everything but numbers from what i get?
You can user this User Defined Function (UDF) that will get only the numbers inside a specific cell.
Code:
Function only_numbers(strSearch As String) As String
Dim i As Integer, tempVal As String
For i = 1 To Len(strSearch)
If IsNumeric(Mid(strSearch, i, 1)) Then
tempVal = tempVal + Mid(strSearch, i, 1)
End If
Next
only_numbers = tempVal
End Function
To use it, you must:
Press ALT + F11
Insert new Module
Paste code inside Module window
Now you can use the formula =only_numbers(A1) at your spreadsheet, by changing A1 to your data location.
Example Images:
Inserting code at module window:
Executing the function
Ps.: if you want to delimit the number of digits to 13, you can change the last line of code from:
only_numbers = tempVal
to
only_numbers = Left(tempVal, 13)
Alternatively you can take a look a this topic to understand how to achieve this using formulas.
If you are going to go to a User Defined Function (aka UDF) then perform all of the actions; don't rely on the preliminary worksheet formula to pass a stripped number and possible suffix text to the UDF.
In a standard code module as,
Function udfJustNumber(str As String, _
Optional delim As String = "number", _
Optional startat As Long = 1, _
Optional digits As Long = 13, _
Optional bCaseSensitive As Boolean = False, _
Optional bNumericReturn As Boolean = True)
Dim c As Long
udfJustNumber = vbNullString
str = Trim(Mid(str, InStr(startat, str, delim, IIf(bCaseSensitive, vbBinaryCompare, vbTextCompare)) + Len(delim), digits))
For c = 1 To Len(str)
Select Case Asc(Mid(str, c, 1))
Case 32
'do nothing- skip over
Case 48 To 57
If bNumericReturn Then
udfJustNumber = Val(udfJustNumber & Mid(str, c, 1))
Else
udfJustNumber = udfJustNumber & Mid(str, c, 1)
End If
Case Else
Exit For
End Select
Next c
End Function
I've used your narrative to add several optional parameters. You can change these if your circumstances change. Most notable is whether to return a true number or text-that-looks-like-a-number with the bNumericReturn option. Note that the returned values are right-aligned as true numbers should be in the following supplied image.
By supplying FALSE to the sixth parameter, the returned content is text-that-looks-like-a-number and is now left-aligned in the worksheet cell.
If you don't want VBA and would like to use Excel Formulas only, try this one:
=SUMPRODUCT(MID(0&MID(D2,SEARCH("number",D2)+6,13),LARGE(INDEX(ISNUMBER(--MID(MID(D2,SEARCH("number",D2)+6,13),ROW($1:$13),1))* ROW($1:$13),0),ROW($1:$13))+1,1)*10^ROW($1:$13)/10)
With the url string below, I need to find the value of the parameter named construction.
<cfset understand = "http://www.example.com/ops.cfm?id=code&construction=148&construction=150&Building=852&Building=665&Building=348&Building=619&Building=625&Building=626&_=1426353166006&action=SUBMIT">
<cfset understand2 = "http://www.example.com/ops.cfm?id=code&construction=AVENT+Construction+Site&construction=Signore+upper+constructions&Building=852&Building=665&Building=348&Building=619&Building=625&Building=626&_=1426353166006&action=SUBMIT">
I then want to check if the value is numeric or a string. I am doing this:
isDefined('understand') and isnumeric(understand)
But it always returns "NO".
Seems like a good case for REGEX, but that's not my strength. If you are always looking for the value of the same item (construction), you could take advantage of the underlying Java and use the STRING.split() method. Then use the Coldfusion val() function to see what you get. The following solution assumes that 0 is not a valid value. If it is then you have more work to do.
<cfscript>
target=understand;
//target=understand2; //uncomment to try the second values
token="construction=";
potentialValues = target.split(token); //creates an array of values using the token as a separator
for (item in potentialValues )
{
writeoutput(val(item) & "<br />"); //val will grab the numerical value and ignore everything that follows. No number will become 0
}
</cfscript>
Try this:
constructionIsAt = find(understand, "construction");
characterAfterConstruction = mid(understand, constructionIsAt + 13, 1);
if isNumeric(characterAfterConstruction) {
code for numeric
}
else {
code for non numeric
}