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Sed Remove All But Letters and Digits

[^[:alnum:]] property will find all non-alphanumerical characters.

Given​

'file' with this content:

MytextOnly !@#!text@@32423#@$text#%$#text%#t23432ext$32342%^-_+-=-_++_;:"'][}}{|\/

Solved Initial​

sed 's/[^[:alnum:]]\+//g' file
MytextOnlytext32423texttextt23432ext32342

Update​

Check my updated answer for allowing forward slash. @Tiago: Quantifier + is used for efficiency so that less # of replacements happen.

sed 's~[^[:alnum:]/]\+~~g' file
MytextOnlytext32423texttextt23432ext32342/

Source​