SUBSTRING a filename in batch - batch-file

Question

I need help to make a batch code (if it's possible) to get substring from filename.
My filename can be like (filename lenght is changing):
7_D_D1_012345678-2015-07-07.pdf
8_A_087654321-2015-07-07.pdf
10_D_D1_011122558-2015-07-07.pdf
100_C_CCC1_C2_C3_C4_055555555-2015-07-07.pdf
file number - from left to first _
id1 - from 1 to n string with _ separator; for example C_C1_C2_C3_C4
id2 - always 9 digits; for example 011122558
date - for example 2015-07-07
extension .jpg
How to loop substring (file number, id1, d2, date) for all filenames in folder and put it to my code
convert - "file number" -annotate "id1" -annotate2 "id2" -annotate "date"
for example:
convert - "01" -annotate "C_C1" -annotate2 "012345678" -annotate "2015-07-07"
Thanks for help.

Answer 1

pure batch. Simple string manipulation mixed with tokenization. No need for additional utilities.
(g.txt holds your example file names; could be replaced by 'dir /b /a-d')
#echo off
for /f %%i in (g.txt) do call :process %%i
goto :eof
:process
set x=%1
set ext=%x:*.=%
for /f "delims=_" %%i in ("%x%") do set fileno=%%i
for /f "tokens=1,*delims=-" %%i in ("%x%") do (
set x1=%%i
set x2=%%j
)
for /f "tokens=1,* delims=." %%i in ("%x2%") do (
set dat=%%i
set ext=%%j
)
set id2=%x1:~-9%
for /f "tokens=1,* delims=_" %%i in ("%x1:~0,-10%") do set id1=%%j
echo filename %x%
echo ------------------------
echo Nr. %fileno%
echo ID1 %id1%
echo ID2 %id2%
echo Date %dat%
echo Ext. %ext%
echo ------------------------
echo convert - "%fileno%" -annotate "%id1%" -annotate2 "%id2% -annotate "%dat%"
echo(
echo(
goto :eof

Answer 2

Since you said Windows 7, I know you have Powershell available. Here is a Powershell script:
$re = '^(\d+)_((?:(?:[a-zA-Z0-9]+)_?)+)_(\d{9})-(\d{4}-\d\d-\d\d)\.(\w+)$'
dir | ForEach-Object {$_ -replace $re, 'convert "$1" -annotate "$2" -annotate2 "$3" -annotate3 "-$4"'}
Given the filenames you gave in your question
7_D_D1_012345678-2015-07-07.pdf
8_A_087654321-2015-07-07.pdf
10_D_D1_011122558-2015-07-07.pdf
100_C_CCC1_C2_C3_C4_055555555-2015-07-07.pdf
It will produce this text output:
convert "100" -annotate "C_CCC1_C2_C3_C4" -annotate2 "055555555" -annotate4 "2015-07-07"
convert "10" -annotate "D_D1" -annotate2 "011122558" -annotate4 "2015-07-07"
convert "7" -annotate "D_D1" -annotate2 "012345678" -annotate4 "2015-07-07"
convert "8" -annotate "A" -annotate2 "087654321" -annotate4 "2015-07-07"
(The filenames were sorted first, so the one starting with 100 comes first and the one starting with 8 comes last).
By redirecting this text output into a .cmd file, you can execute the convert commands as desired.
Here is the breakdown of that regular expression:
Beginning of line or string
[1]: A numbered capture group. [\d+]
Any digit, one or more repetitions
_
[2]: A numbered capture group. [(?:(?:[a-zA-Z0-9]+)_?)+]
Match expression but don't capture it. [(?:[a-zA-Z0-9]+)_?], one or more repetitions
(?:[a-zA-Z0-9]+)_?
Match expression but don't capture it. [[a-zA-Z0-9]+]
Any character in this class: [a-zA-Z0-9], one or more repetitions
_, zero or one repetitions
_
[3]: A numbered capture group. [\d{9}]
Any digit, exactly 9 repetitions
-
[4]: A numbered capture group. [\d{4}-\d\d-\d\d]
\d{4}-\d\d-\d\d
Any digit, exactly 4 repetitions

Answer 3

#echo off
setlocal enableextensions disabledelayedexpansion
rem For each file
for /r "x:\starting\folder" %%z in (*.pdf) do (
rem Separate number part
for /f "tokens=1,* delims=_" %%a in ("%%~nz") do (
set "_number=%%~a"
set "_file=%%~fz"
rem Separate date and ids
for /f "tokens=1,* delims=-" %%c in ("%%~b") do (
set "_date=%%~d"
set "_ids=%%~c\."
)
)
rem Separate id1 from id2 handling the string as a path
rem This way id2 is the last element and the path to it
rem is id1
setlocal enabledelayedexpansion
for /f "delims=" %%e in ("::!_ids:_=\!") do (
endlocal
set "_id2=%%~nxe"
set "_id1=%%~pe"
)
rem Correct id1 contents (it is a path) changing backslashes
rem to underscores. As there are initial and ending backslashes,
rem later we will remove the initial and ending underscores
setlocal enabledelayedexpansion
for /f "delims=" %%e in ("!_id1:\=_!") do (
endlocal
set "_id1=%%~e"
)
rem Execute final command
setlocal enabledelayedexpansion
echo(
echo file[!_file!]
echo convert - "!_number!" -annotate "!_id1:~1,-1!" -annotate2 "!_id2!" -annotate "!_date!"
endlocal
)