what will be a good regex to extract pure numbers out of "25 10a 36 10b 30"

Question

Hi friends i was in need of a regex which will return only 25,36,30 for me from

25 10a 36 10b 30

as they are the only pure numbers in the sequence.

I tried this but it did not work for me :

(^|[ ])\d+|($|[ ])

Any suggestions?

Answer 1

Noticing your multiple regex questions might I suggest some educational reading. Regular-Expressions.info has some great tutorials for getting acquainted with RegEx.

Answer 2

You can use \b for word boundary.

i guess something like:

\b\d+\b

Answer 3

This one should do the work:

\b\d+\b

Answer 4

You could use the word boundary option:

\b(\d+)\b

but some punctuation characters will be marked as a word boundary so this won't give what you want.

So it looks like you'll have to explicitly look for whitespace:

/(^|\s+)(\d+)(\s+|$)/

When extracting the number remember to get the second group as the first will only have spaces in it.

Answer 5

If you're looking for integers only, use \b\d+\b.

Answer 6

\d+ is all you need. If you're using C#, note the difference between 'Match' and 'Matches' on the Regex object. One finds a single match, the other finds multiple non-overlapping matches.

http://msdn.microsoft.com/en-us/library/30wbz966(VS.71).aspx

Answer 7

Apply globally:

(?<=^|\s)\d+(?=\s|$)