I'm doing a little string validation with findstr
and its /r
flag to allow for regular expressions. In particular I'd like to validate integers.
The regex
^[0-9][0-9]*$
worked fine for non-negative numbers but since I now support negative numbers as well I tried
^([1-9][0-9]*|0|-[1-9][0-9]*)$
for either positive or negative integers or zero.
The regex works fine theoretically. I tested it in PowerShell and it matches what I want. However, with
findstr /r /c:"^([1-9][0-9]*|0|-[1-9][0-9]*)$"
it doesn't.
While I know that findstr
doesn't have the most advanced regex support (even below Notepad++ which is probably quite an achievement), I would have expected such simple expressions to work.
Any ideas what I'm doing wrong here?
This works for me:
findstr /r "^[1-9][0-9]*$ ^-[1-9][0-9]*$ ^0$"
If you don't use the /c
option, the <Strings>
argument is treated as a space-separated list of search strings, which makes the space a sort of crude replacement for the |
construct. (As long as your regexes don't contain spaces, that is.)