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4GuysFromRolla.com : ASP FAQS : Strings


How can I change a string like $51,234.98 into a number (51234.98)

[Print this FAQ]

Answer: If you are sure your string is a well-formed text number (i.e. it's not 123xyz456 or something that doesn't really represent the value you want) then you can simply clean the offending characters and spaces from it with a regular expression.

In VBScript:

Function StripNonNum(strInput)
  Dim regEx
' Create a regular expression
  Set regEx = New RegExp

' Match any character NOT in this list
  regEx.Pattern = "[^0123456789\.]"
  regEx.IgnoreCase = True
  regEx.Global = True

' Replace matches with zero length string
  StripNonNum = regEx.Replace(strInput, "")
End Function

' Returns: 51234.98
Response.Write StripNonNum("$51, 234.98")

Or in JScript:


// Acts exactly the same as the VBScript version
function MakeNumber(strInput) {
  var re = new RegExp('[^1234567890\.]', 'gi')
  return(strInput.replace(re, ''));

// Returns 51234.98
Response.Write(MakeNumber('$51, 234.98'));

For more information on regular expressions be sure to check out the Regular Expression Article Index! Happy Programming!

Addendum by Bill Wilkinson (10/16/2000 6:30:00 PM)

VBScript actually has a built-in function that will do this work for you. Further, it is "localized," meaning that if you use it in the USA it will recognize the dollar sign as a currency symbol but in Japan it will recognize the yen sign, etc.

The function is CCur, meaning "Convert CURrency."

Some examples:

Response.Write CCur("$51,234.98") ' will write 51234.98
Response.Write CCur("4.55555") ' will write 4.5556

Note that currency is always represented internally by MS with four digits to the right of the decimal point, hence the rouding on that second example.

A sneaky way to use CCur and, at the same time, check for errors might go something like this:

val = "NOT VALID"
On Error Resume Next
val = CCur( Request("money") )
On Error Goto 0
Response.Write val

If you happen to want to process Deutshce Marks (money in Germany), you could just add

Session.LCID = 1031

and now $12,345.67 will be rejected but 123.456,78 DM will be accepted! Can be quite handy for sites that need to handle several different national currencies.

FAQ posted by Richard Lowe at 10/15/2000 6:15:46 PM to the Strings category. This FAQ has been viewed 64,982 times.

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Last computed at 9/17/2007 3:22:00 AM

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