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Shisho has two major features: (1) pattern matching for code and (2) transformation of the matched code. To use them, you need to write a rule, including patterns, rule constraints, and rewrite patterns. The following page explains these concepts with tutorials:

• "Pattern", which describes the code to search.
• "Rule and Rule Set", which bundles miscellaneous information on pattern matching and code transformation.
• "Rule Constraint", which imposes additional constraints on pattern matching.
• "Rewrite Option(s)", which describes how the matched parts of the code should be rewritten.