كيف يمكن قطع جزء من النص في صيغة تكويد الملفات؟

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The following functions can do that
$left
$right
$mid

Examples:<br/>
Suppose name1 is abcdef
${name1.$left_1} -> a
${name1.$left_2} -> ab

${name1.$right_1} -> f
${name1.$right_2} -> ef
${name1.$right_3} -> def

${name1.$mid_2_1} -> b
${name1.$mid_3_3} -> cde

They behave exactly like SQL Server: left,right, and substring