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VBScript RegExp Object Pattern

Posted on 2015-02-10
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Last Modified: 2015-02-10
I need some vbscript code to check a string to ensure it only has A-Z, 0-9, period or underscore characters in it.

I found VBScript RegExp Object, but I cannot figure out what to use for my pattern.

Any help would be greatly appreciated.
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Question by:BFanguy
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21 Comments
 
LVL 59

Expert Comment

by:Bill Prew
ID: 40601128
Sure, are you intending to do this in a stand alone VBS script that does other things, or as part of a web page?

~bp
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Author Comment

by:BFanguy
ID: 40601143
stand alone vbs script.

something simple like

str = "12aB.3_4"
Set myRegExp = New RegExp
myRegExp.IgnoreCase = True
myRegExp.Pattern = "^[A-Z0-9]{5}\d$"  ' i know this is not my needed pattern, but something like this
isValid = myRegExp.Test(str)    ' returns True in this case
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LVL 59

Expert Comment

by:Bill Prew
ID: 40601270
Give this a try:

isValid will follow normal boolean practice in VBS, so will be -1 for True, and 0 for False.

str = "12aB.3_4"
Set myRegExp = New RegExp
myRegExp.IgnoreCase = True
myRegExp.Pattern = "^[a-zA-Z0-9_.]*$"
isValid = myRegExp.Test(str)
Wscript.Echo isValid

Open in new window

~bp
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LVL 28

Assisted Solution

by:MacroShadow
MacroShadow earned 200 total points
ID: 40601274
Try this pattern:
[A-Za-z0-9]{4}.\d_\d

Open in new window

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Author Comment

by:BFanguy
ID: 40601428
thanks, i also need to add a dash, how would i add it to the pattern?
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Author Comment

by:BFanguy
ID: 40601432
and a quote
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Author Comment

by:BFanguy
ID: 40601464
macroshadow,

what does the {4} do?
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LVL 35

Expert Comment

by:Terry Woods
ID: 40601497
Including underscore, single quote and dash:
 myRegExp.Pattern = "^[A-Z0-9_'\-]+$"

Open in new window

Change the + to a * character if an empty string is ok.

The {4} means match exactly four of the previous character.
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Author Comment

by:BFanguy
ID: 40601500
thanks, but was looking for double quote  "
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LVL 35

Assisted Solution

by:Terry Woods
Terry Woods earned 200 total points
ID: 40601502
In case you're interested, the pattern:
[A-Za-z0-9_]
can be abbreviated to just \w or [\w] so provided that you're happy to accept lower case your pattern could be simplified to:
"^[\w\-\"]+$"
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Author Comment

by:BFanguy
ID: 40601506
and the dash does not work, it thinks its a range  like a-z
0
 

Author Comment

by:BFanguy
ID: 40601514
sorry, for piecemealing this, but i am finding that i need more than just the couple of special characters.
so what i need is the /w and.
Asterisk, comma, quotes, dash, slash, pound, plus, single quote, period, underscore
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Author Comment

by:BFanguy
ID: 40601527
sorry, backslash not slash

the quotes " and the dash - are the ones i am having trouble with.

if i use the \" how does it know if i am including the backslash and the quotes or if this is for the quote.

again, thank you for your help
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Author Comment

by:BFanguy
ID: 40601536
also need a space included.

As far as i can tell this works for everything but the dash and the double quotes
"^[a-zA-Z0-9_./'*,#+ ]*$"
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LVL 59

Expert Comment

by:Bill Prew
ID: 40601541
Backslash is always treated as an "escape" character, the only way to get an actually backslash is to escape it, so \\.

Take a look at these sites for Regex info:

http://www.tutorialspoint.com/vbscript/vbscript_reg_expressions.htm
http://www.regular-expressions.info/vbscriptexample.html

~bp
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LVL 59

Expert Comment

by:Bill Prew
ID: 40601545
Try this:

"^[a-zA-Z0-9_./'*,#+ \\\-]*$"
0
 

Author Comment

by:BFanguy
ID: 40601552
thanks, but i think i am still missing the " (quotes) character.

i.e. it fails on this string value:
FLWS 1/2" .78" .65"
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Author Comment

by:BFanguy
ID: 40601555
can i use a Chr(34) somehow?
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Author Comment

by:BFanguy
ID: 40601561
this works....

"^[a-zA-Z0-9_./'*,#+" & Chr(34) & " \\\-]*$"
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LVL 59

Accepted Solution

by:
Bill Prew earned 1600 total points
ID: 40601598
For quote you can also do the following.  Within a quoted string, pairs of double quotes are always replaced by a single double quote.

"^[a-zA-Z0-9_./'*,#+ ""\\\-]*$"

~bp
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Author Comment

by:BFanguy
ID: 40601609
Thanks guys
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