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Use subpatterns in FINDSTR

I have to check the correctness of the string stored in the variable, I can not use external CLI utilities (grep, awk, etc.), so I chose FINDSTR. The string has this format (in regexp):

([1-9][0-9]*:".*"(|".*")*)

I do not know how to check the subpattern (|. "*"). My current code is:

((ECHO.) | (SET /P "=(11:"a"|"b"|"c")") | (FINDSTR /R /C:"^([1-9][0-9]*:".*")$"))

Sincerely.

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2 answers

Mat M is correct regarding the FINDSTR constraint. FINDSTR regex support is very primitive and non-standard. Type HELP FINDSTRor FINDSTR /?from the command line to get an overview of what is supported. For a detailed explanation, see What are the undocumented features and limitations of the Windows FINDSTR command?

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var.

@echo off
setlocal
set LF=^


::Above 2 blank lines are critical for creating a linefeed variable. Do not remove

set test=a

for %%S in (
  "(3:"a"|"c"|"c")"
  "(11:"a"|"b"|"c"|"d"|"esdf"|"f"|"g"|"h"|"i"|"j"|"k")"
  "(4:"a"|"b"|"c")"
  "(10:"a"|"b"|"c"|"d"|"esdf"|"f"|"g"|"h"|"i"|"j"|"k")"
  "(3:"a"|"b"|"c""
  "(3:"a"|"b^|c")"
  "(3:"a"|"b"|c)"
  "(3:"a"|"b"||"c")"
  "(3:"a"|"b"|;|"c")"
) do (
  set "var=%%~S"
  call :validate
)
exit /b

:validate
setlocal enableDelayedExpansion
cmd /v:on /c echo ^^^!var^^^!|findstr /r /c:"^([1-9][0-9]*:.*)$" >nul || (call :invalid  FINDSTR fail& exit /b)
if "!var:||=!" neq "!var!" (call :invalid double pipe fail& exit /b)
for /f "delims=(:" %%N in ("!var!") do set "expectedCount=%%N"
set "str=!var:*:=!"
set "str=!str:~0,-1!"
set foundCount=0
for %%A in ("!LF!") do for /f eol^=^%LF%%LF%^ delims^=  %%B in ("!str:|=%%~A!") do (
  if %%B neq "%%~B" (call :invalid sub-pattern fail& exit /b)
  set /a foundCount+=1
)
if %foundCount% neq %expectedCount% (call :invalid count fail& exit /b)
echo Valid: !var!
exit /b
:invalid
echo Invalid - %*: !var!
exit /b

script

Valid: (3:"a"|"c"|"c")
Valid: (11:"a"|"b"|"c"|"d"|"esdf"|"f"|"g"|"h"|"i"|"j"|"k")
Invalid - count fail: (4:"a"|"b"|"c")
Invalid - count fail: (10:"a"|"b"|"c"|"d"|"esdf"|"f"|"g"|"h"|"i"|"j"|"k")
Invalid - FINDSTR fail: (3:"a"|"b"|"c"
Invalid - sub-pattern fail: (3:"a"|"b|c")
Invalid - sub-pattern fail: (3:"a"|"b"|c)
Invalid - double pipe fail: (3:"a"|"b"||"c")
Invalid - sub-pattern fail: (3:"a"|"b"|;|"c")


:validate , CMD /V:ON. , ! .

:validate
cmd /v:on /c echo !var!|findstr /r /c:"^([1-9][0-9]*:.*)$" >nul || (call :invalid  FINDSTR fail& exit /b)
setlocal enableDelayedExpansion
... remainder unchanged
+6

, findstr , (|".*")* - -. , , ,

FINDSTR /R /C:"^([1-9][0-9]*:\"..*\"|\"..*\"|\"..*\")$"

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..* .+: .

+2

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