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StringReplace

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StringReplace["string“, ”a"->"b"]

replaces each occurrence of old with new in string.

StringReplace["string", {"$s_1$"->"$sp_1$“, ”$s_2$"->"$sp_2$"}]

performs multiple replacements of each si by the
corresponding spi in string.

StringReplace["string", srules, n]

only performs the first n replacements.

StringReplace[{"$string_1$“, ”$string_2$", ...}, srules]

performs the replacements specified by srules on a list
of strings.

StringReplace replaces all occurrences of one substring with another:

• • StringReplace["xyxyxyyyxxxyyxy", "xy" -> "A"]

Multiple replacements can be supplied:

• • StringReplace["xyzwxyzwxxyzxyzw", {"xyz" -> "A", "w" -> "BCD"}]

Only replace the first 2 occurrences:

• • StringReplace["xyxyxyyyxxxyyxy", "xy" -> "A", 2]

Also works for multiple rules:

• • StringReplace["abba", {"a" -> "A", "b" -> "B"}, 2]

StringReplace acts on lists of strings too:

• • StringReplace[{"xyxyxxy", "yxyxyxxxyyxy"}, "xy" -> "A"]

StringReplace also can be used as an operator:

• • StringReplace["y" -> "ies"]["city"]