Textbox should accept starting with SV or AV only(regular expression)

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Hi all,
i need small help on one validation issue,
Textbox should accept starting with SV or AV with numbers. need reg expression to validate it.

Could you please help me to solve the issue.

Thanks in Advance!

What I have tried:

I have tried the following reg exp.

Regex VRegex =  new Regex(@"[SV]|[AS]\d{9}\.\d{1}");
Regex VRegex =  new Regex(@"{SV}|{AS}\d{9}\.\d{1}");

Posted 2-Dec-21 20:11pm

VenkataSeshu B

Updated 2-Dec-21 22:50pm

Richard Deeming

v5

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Richard Deeming 3-Dec-21 4:50am

Removing the content of your question after it has been answered is extremely rude. I have rolled back your destructive edit.

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OriginalGriff · Answer 1 · 2021-12-02T20:24:00

Start by learning how regexes work: [SV] matches a single character, either an 'S' or a 'V', not the string "SV".

You need to add a "start of string" indicator as well (probably an "end of string" indicator will help also), and check that all you numbers will be exactly 9 digits, a decimal point, and a single digit to finish with.
In addition, you will need to "group things" in order to get the alternatives to work correctly.
Get a copy of Expresso[^] - it's free, and it examines and generates Regular expressions.

I could just give it to you, but you'd learn nothing from that, and it should take you no more than two minutes to build and test the regex in Expresso anyway. Give it a try, and if you can;t work it out, show us what you ended up with and I'll help further. But Regexes do ned to be understood, and the best way to do that is to create them! Give it a try - it is pretty simple, really!