expr //. rules repeatedly performs replacements until expr no longer changes.

Everything that Mathematica does can be thought of as derived from its ability to apply general transformation rules to arbitrary symbolic expressions. The Mathematica ...

Applying transformation rules. The replacement operator /. (pronounced "slash-dot") applies rules to expressions. You can give a list of rules to apply. Each rule will be ...

Looping is a core concept in programming. Mathematica provides powerful primitives for specifying and controlling looping, not only in traditional procedural programming, but ...

At the core of Mathematica's symbolic programming paradigm is the concept of transformation rules for arbitrary symbolic patterns. Mathematica's pattern language conveniently ...

You may find it useful to use one or more rules with an expression several times. Mathematica provides functions that let you iterate when using rules with expressions. In ...

Rules are a key part of Mathematica 's powerful expression transformation language. These "How tos" give step-by-step instructions for using rules in Mathematica .

MaxIterations is an option that specifies the maximum number of iterations that should be tried in various built-in functions and algorithms.

expr /. rules applies a rule or list of rules in an attempt to transform each subpart of an expression expr.

Replace[expr, rules] applies a rule or list of rules in an attempt to transform the entire expression expr. Replace[expr, rules, levelspec] applies rules to parts of expr ...