Regular expressions in findstr
- by Johannes Rössel
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?
