Windows batch script - Regular expression for file names - windows

Question

I am using below batch script to copy .class files from dir sourcedir2 to dir sourcedir1 based on same matched file names.
#ECHO OFF
SETLOCAL ENABLEDELAYEDEXPANSION
SET "sourcedir1=U:\sourcedir\changeset"
SET "sourcedir2=U:\sourcedir\target"
FOR /f "delims=" %%a IN ('dir /b /s /a-d "%sourcedir1%\*.java" ') DO (
SET "javadir=%%~dpa"
SET "classfile=!javadir:%sourcedir1%=%sourcedir2%!%%~na.class"
IF EXIST !classfile! ECHO COPY "!classfile!" "%%a"
)
GOTO :EOF
Addition to this I wanted to copy .class files which are having filename format as classname$number.class (ex :Action$1.class ,Action$2.class) from dir sourcedir2 to dir sourcedir1.
I tried the change for SET classfile as below but also it will copy files which are not in the format of classname$number.class
SET "classfile=!javadir:%sourcedir1%=%sourcedir2%!%%~na*.class"
Please suggest me Regularexpression to match file names with having only format as classname$number.class or classname.class .
Thank you ..

Answer 1

This PowerShell script copies from sourcedir2 to sourcedir1 based on the filename matching a regex for the class name and any digits before the .class extension. When you are confident that the correct files will be copied, remove the -WhatIf from the Copy-Item cmdlet.
$sourcedir1 = 'C:\src\t\j1'
$sourcedir2 = 'C:\src\t\j2'
Get-ChildItem -Path $sourcedir1 -File -Recurse -Filter '*.java' |
ForEach-Object {
$classname = $_.BaseName
Get-ChildItem -Path $sourcedir2 -File -Filter "$classname*.class" |
Where-Object { $_.Name -match "$classname\$[0-9]*\.class" } |
ForEach-Object { Copy-Item $_.FullName $sourcedir1 -WhatIf }
}
To run this from a cmd shell, put the code above into a file such as copyclasses.ps1 and use:
powershell -NoProfile -File .\copyclasses.ps1

Answer 2

I am able to find the workaround solution with below script. Thank you.
#ECHO OFF
SETLOCAL ENABLEDELAYEDEXPANSION
SET "sourcedir1=U:\sourcedir\changeset"
SET "sourcedir2=U:\sourcedir\target"
FOR /f "delims=" %%a IN ('dir /b /s /a-d "%sourcedir1%\*.java" ') DO (
SET "javadir=%%~dpa"
SET "classfile=!javadir:%sourcedir1%=%sourcedir2%!%%~na.class"
IF EXIST !classfile! ECHO COPY "!classfile!" "%%a"
SET "innerclassfile=!javadir:%sourcedir1%=%sourcedir2%!%%~na"$"*.class"
IF EXIST !innerclassfile! ECHO COPY "!innerclassfile!" "%%a"
)
GOTO :EOF