RegEx for Matching Numeric Patterns With or Without Dashes - regex

Question

Are Email Host has a back end Archiving platform. I asked them if we could be alerted if certain formats are located within the Email and they asked me to submit them a RegEx Query String so they can put it into there system. I Know there Main Email System is Exchange, how ever I am not sure what there backend is.... I am assuming exchange and I apologize for I did not even think to ask for that piece of info.
NEED TO LOOK FOR THE FOLLOWING DIGIT PATTERNS (which is for Social Security # Formats)
9 digit formats:
XXX-XX-XXXX
XXXXXXXXX
XX-XXXXXXX
NEED TO LOOK FOR THE FOLLOWING DIGIT PATTERNS (which is for Customer Acct # Formats)
8 digit formats:
xxxxxxxx
I have not tried anything for I am not sure on how to test with out submitting to my host. But this is what I cam up with Two stings to accomplish the task for both 8 and 9 digit patterns
Regex.Match([/d]+[/d]+\-?[/d]+\-?[/d]+[/d-]+\-?[/d]+[/d]+[/d]+[/d]);
``
Regex.Match([/d]+[/d]+[/d]+[/d]+[/d]+[/d]+[/d]+[/d]);
I would expect the output to be any email that matches the numeric sequence pattern

Answer 1

I would use the following regex pattern, which is an alternation of three terms:
\d{8}\d?|\d{3}-\d{2}-\d{4}|\d{2}-\d{7}
Demo
Note that a single digit in regex is represented by \d, with a single backslash, not a forward slash.

Answer 2

Just for simplicity, you might want to design an easy expression, maybe something similar to this, to be easy to be changed whenever you wish:
([0-9]{3}-[0-9]{2}-[0-9]{4})|([0-9]{9})|([0-9]{2}-[0-9]{7})|([0-9]{8})
It has four groups for each of your numbers:
([0-9]{3}-[0-9]{2}-[0-9]{4}) for SSN type 1
([0-9]{9}) for SSN type 2
([0-9]{2}-[0-9]{7}) for SSN type 3
([0-9]{8}) which is for customer account number
You can simply join this groups with an OR:
([0-9]{3}-[0-9]{2}-[0-9]{4})|([0-9]{9})|([0-9]{2}-[0-9]{7})|([0-9]{8})
If you wish to have two separate expressions, you might want to join the first two:
([0-9]{3}-[0-9]{2}-[0-9]{4})|([0-9]{9})|([0-9]{2}-[0-9]{7})
and your second expression would work as:
([0-9]{8})
You can add additional boundaries to it if you wish. For example, you can bound them with start and end chars:
Both RegEx:
^([0-9]{3}-[0-9]{2}-[0-9]{4})|([0-9]{9})|([0-9]{2}-[0-9]{7})|([0-9]{8})$
SSN RegEx:
^([0-9]{3}-[0-9]{2}-[0-9]{4})|([0-9]{9})|([0-9]{2}-[0-9]{7})$
Customer Account RegEx:
^([0-9]{8})$
Graph
This graph shows how the expression would work and you can visualize other expressions in this link:
JavaScript Testing
const regex = /([0-9]{3}-[0-9]{2}-[0-9]{4})|([0-9]{9})|([0-9]{2}-[0-9]{7})|([0-9]{8})/gm;
const str = `111-22-3333
111223333
11-1234567
12345678`;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}