string map

string map ?-nocase? mapping string
Replaces substrings in string based on the key-value pairs in mapping. mapping is a list of key value key value … as in the form returned by array get. Each instance of a key in the string will be replaced with its corresponding value. If -nocase is specified, then matching is done without regard to case differences. Both key and value may be multiple characters. Replacement is done in an ordered manner, so the key appearing first in the list will be checked first, and so on. string is only iterated over once, so earlier key replacements will have no affect for later key matches. For example,
string map {abc 1 ab 2 a 3 1 0} 1abcaababcabababc

will return the string 01321221.
Note that if an earlier key is a prefix of a later one, it will completely mask the later one. So if the previous example is reordered like this,

string map {1 0 ab 2 a 3 abc 1} 1abcaababcabababc

it will return the string 02c322c222c.

用法：string map ?-nocase? charMap string

如string map {1 “”} 121212321; => 22232
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