Regex for number at the end of string?

Question

I want to find out if a string ends with number (with/without decimal). If it ends, I want to extracts it.

"Test1" => 1
"Test"  => NOT FOUND
"Test123" => 123
"Test1.1" => 1.1

I have missed a few details.
1. Prior to number, string can contain special characters also
2. It is single line, not multiline.

what do you expect in the string preceding the final number - just letters or basically anything ? — Joanna Derks, Jan 12 '13 at 14:24
When you say "string" did you mean multiline or single line? — Hamlet Hakobyan, Jan 12 '13 at 14:29

score 10 · Answer 1 · edited Aug 26 '21 at 08:00

10

give this pattern a try,

\d+(\.\d+)?$

A version with a non-capturing group:

\d+(?:\.\d+)?$

edited Aug 26 '21 at 08:00

Wiktor Stribiżew

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answered Jan 12 '13 at 14:20

John Woo

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Joanna Derks · Answer 2 · 2013-01-12T14:39:51.890

Matches line start, any chars after that and a a number (with optional decimal part) at the end of the string (allowing trailing whitespace characters). The fist part is a lazy match, i.e. it will match the lowest number of chars possible leaving the whole number to the last part of the expression.

^.*?(\d+(?:[.,]\d+)?)\s*$

My test cases

"Test1
"Test
"Test123
"Test1.1
test 1.2 times 1 is 1.2
test 1.2 times 1 is ?
test 1.2 times 1 is 134.2234
1.2

score 3 · Answer 3 · answered Jan 12 '13 at 18:27

3

Use the following regex in c# (\d+)$

answered Jan 12 '13 at 18:27

sreejithsdev

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Johanna Larsson · Answer 4 · 2013-01-12T14:38:24.227

2

A regex for a string that ends with a number: @"\d$". Use http://regexpal.com/ to try out regexes.

Of course, that just tells you that the last character is a number. It doesn't capture anything other than the last character. To capture the number only this is needed: @"\d*\.?\d+$".

If your string can be more complicated, eg "Test1.2 Test2", and you want both numbers: @"\d*\.?\d+\b".

edited Jan 12 '13 at 14:38

answered Jan 12 '13 at 14:18

Johanna Larsson

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@JoannaTurban the regex works for the last example too. It just checks whether the last character in the string is a number. – Johanna Larsson Jan 12 '13 at 14:21
@Esailija ah I misunderstood, I thought he wanted to know if the string ended with a number. In that case he could just grab the whole string, was my reasoning! – Johanna Larsson Jan 12 '13 at 14:23
if you make the dot and the digits after the dot separate optional groups you can end up with a match "1." – Joanna Derks Jan 12 '13 at 14:35
@JoannaTurban fair point, I wonder if .2 should be a valid number – Johanna Larsson Jan 12 '13 at 14:36

score 1 · Answer 5 · answered Jan 12 '13 at 14:18

1

use this regex [a-zA-Z]+\d+([,.]\d+)?\b$ if you want digit only use this one (?<=[a-zA-Z]+)\d+([,.]\d+)?\b$

answered Jan 12 '13 at 14:18

burning_LEGION

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Regex for number at the end of string?

5 Answers5

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