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Returns a copy of self with leading substring prefix removed:

'hello'.delete_prefix('hel')      # => "lo"
'hello'.delete_prefix('llo')      # => "hello"
'тест'.delete_prefix('те')        # => "ст"
'こんにちは'.delete_prefix('こん')  # => "にちは"

Related: String#delete_prefix!, String#delete_suffix.