<item id="Cbeta.ttf" href="Fonts/Cbeta.ttf" media-type="application/x-font-ttf"/>
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$root = "."
$insert = '    <item id="Cbeta.ttf" href="Fonts/Cbeta.ttf" media-type="application/x-font-ttf"/>'

$fld = Get-ChildItem -Directory -Path $root
$fld | ForEach-Object {
    if ( Test-Path (Join-Path $_.FullName "\Fonts\Cbeta.ttf") ) {
        $file = Get-Content -Encoding UTF8 (Join-Path $_.FullName "content.opf")
        $file = $file -replace '(?=</manifest>)',($insert + "`r`n")
        $file
 #       $file | Out-File -Encoding UTF8 (Join-Path $_.FullName "content.opf")
    }
}
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@cd /d %~dp0 & powershell -command "Get-Content '%~0' | Select-Object -Skip 1 | Out-String | Invoke-Expression" & pause & exit/b
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<# :
cls&echo off&cd /d "%~dp0"&mode con lines=5000
path %SYSTEMROOT%\System32\WindowsPowerShell\v1.0;%path%
set "current=%cd%"
powershell -NoProfile -ExecutionPolicy bypass "Get-Content -literal '%~f0'|Out-String|Invoke-Expression"
pause
exit
#>
$insertstr='    <item id="Cbeta.ttf" href="Fonts/Cbeta.ttf" media-type="application/x-font-ttf"/>';
$current=($env:current).trimend('\');
$enc=New-Object System.Text.UTF8Encoding $False;
$folders=@(dir -literal $current -recurse|?{$_ -is [System.IO.DirectoryInfo]});
for($i=0;$i -lt $folders.length;$i++){
    if($folders[$i].Name -eq 'OEBPS'){
        $ttffile=$folders[$i].FullName+'\Fonts\Cbeta.ttf';
        $opffile=$folders[$i].FullName+'\content.opf';
        if((test-path -literal $ttffile) -and (test-path -literal $opffile)){
            write-host $ttffile;
            write-host $opffile;
            $text=[IO.File]::ReadAllText($opffile, $enc);
            $text=[regex]::replace($text, '([^\r\n]+([\r\n]+))([\t ]*?</manifest>)', {
                param($m);
                if($m.groups[0].value.Contains($insertstr)){
                    return $m.groups[0].value;
                }else{
                    return $m.groups[1].value+$insertstr+$m.groups[2].value+$m.groups[3].value;
                }
            });
            [IO.File]::WriteAllText($opffile, $text, $enc);
            write-host '';
        }
    }
}
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$root = "."
$str1 = '</manifest>'
$str2 = '    <item id="Cbeta.ttf" href="Fonts/Cbeta.ttf" media-type="application/x-font-ttf"/>'


$fld = Get-ChildItem -Directory -Path $root
$fld | ForEach-Object {
    if ( Test-Path (Join-Path $_.FullName "\Fonts\Cbeta.ttf") ) {
        $file = Get-Content -Encoding UTF8 (Join-Path $_.FullName "content.opf")
        if ( -not ($file -match $str2) ) {
            $file = $file -replace "(?=$str1)",($str2 + "`r`n")
            $file | Out-File -Encoding UTF8 (Join-Path $_.FullName "content.opf")
        }
    }
}
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