For example, a token-ring packet's source route field is Boolean. Integer fields are converted to their decimal representation.Īn integer may be expressed in decimal, octal, or hexadecimal notation, or as a C-style character constant. Upper() and lower() are useful for performing case-insensitive string comparisons. The “matches” or “~” operator allows a filter to apply to a specified Perl-compatible regular expression (Pure).
The “contains” operator cannot be used on atomic fields, such as numbers or IP addresses. Think of a protocol or field in a filter as implicitly having the “exists” operator. The simplest filter allows you to check for the existence of a protocol or field.
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