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I need to extract the last number that is inside a string. I'm trying to do this with regex and negative lookaheads, but it's not working. This is the regex that I have:
\d+(?!\d+) And these are some strings, just to give you an idea, and what the regex should match:
ARRAY[123] matches 123 ARRAY[123].ITEM[4] matches 4 B:1000 matches 1000 B:1000.10 matches 10 And so on. The regex matches the numbers, but all of them. I don't get why the negative lookahead is not working. Any one care to explain?
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End of String or Line: $ The $ anchor specifies that the preceding pattern must occur at the end of the input string, or before \n at the end of the input string. If you use $ with the RegexOptions. Multiline option, the match can also occur at the end of a line.
To match any number from 0 to 9 we use \d in regex. It will match any single digit number from 0 to 9. \d means [0-9] or match any number from 0 to 9. Instead of writing 0123456789 the shorthand version is [0-9] where [] is used for character range.
$ means "Match the end of the string" (the position after the last character in the string).
Your regex \d+(?!\d+) says
match any number if it is not immediately followed by a number.
which is incorrect. A number is last if it is not followed (following it anywhere, not just immediately) by any other number.
When translated to regex we have:
(\d+)(?!.*\d) Rubular Link
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