RegEx用于从字符串中提取数字

Question

I have a bunch of files in a directory, mostly labled something like...

PO1000000100.doc or .pdf or .txt Some of them are PurchaseOrderPO1000000109.pdf

What i need to do is extract the PO1000000109 part of it. So basically PO with 10 numbers after it... How can I do this with a regex?

(What i'll do is a foreach loop on the files in the directory, get the filename, and run it through the regex to get the PO number...)

I'm using C# - not sure if this is relevant.

Answer 1

Try this

String data = 
  Regex.Match(@"PO\d{10}", "PurchaseOrderPO1000000109.pdf", 
    RegexOptions.IgnoreCase).Value;

Could add a Regex.IsMatch with same vars above ofc :)

Answer 2

If the PO part is always the same, you can just get the number without needing to use a regex:

new string(theString.Where(c => char.IsDigit(c)).ToArray());

Later you can prepend the PO part manually.

NOTE : I'm assuming that you have only one single run of numbers in your strings. If you have for example "abc12345def678" you will get "12345678" , which may not be what you want.

Answer 3

Regex.Replace(fileName, @"^.?PO(\d{10}).$", "$1");

将星星放在圆点后面。

Answer 4

string data="PurchaseOrderPO1000000109.pdf\nPO1000000100.doc";
MatchCollection matches = Regex.Matches(data, @"PO[0-9]{10}");
foreach(Match m in matches){
    print(m.Value);
}

Results

PO1000000109
PO1000000100

Answer 5

This RegEx will pick up all numbers from a string \\d* .

As described here .

Answer 6

可能的正则表达式可能是：

^.*(\d{10})\.\D{3}$

Answer 7

var re = new System.Text.RegularExpressions.Regex("(?<=^PurchaseOrder)PO\\d{10}(?=\\.pdf$)");
Assert.IsTrue(re.IsMatch("PurchaseOrderPO1234567890.pdf"));
Assert.IsFalse(re.IsMatch("some PurchaseOrderPO1234567890.pdf"));
Assert.IsFalse(re.IsMatch("OrderPO1234567890.pdf"));
Assert.IsFalse(re.IsMatch("PurchaseOrderPO1234567890.pdf2"));