validate textfield contents in wordpress simple job board plugin

how to validate text field content in job application form ?? to make sure the content holding only characters from A-Z and a-z, to avoid SQL injection and other bad string such as |_”‘$@!;…etc ???

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Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)