Created
November 13, 2011 12:37
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Beautiful Codeの正規表現マッチャのRuby移植版
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class MyRegexp | |
def self.match(regexp, text) | |
if regexp[0] == '^' | |
return matchhere(regexp[1,regexp.size], text) | |
end | |
text.chars.with_index do |c,i| | |
return true if matchhere(regexp, text[i,text.size]) | |
end | |
return false | |
end | |
def self.matchhere(regexp, text) | |
return true if regexp.size == 0 | |
return false if regexp[0] == '$' and regexp.size == 1 | |
if regexp[1] == '*' | |
return matchstar(regexp[0], regexp[2,regexp.size]. text) | |
end | |
if regexp[0] == '.' or regexp[0] == text[0] | |
return matchhere(regexp[1, regexp.size], text[1, text.size]) | |
end | |
end | |
def self.matchstar(char, regexp, text) | |
text.chars.with_index do |c,i| | |
return true if matchhere(regexp, text) | |
break if char == text[0] or char == '.' | |
text = text[1,text.size] | |
end | |
end | |
end | |
p MyRegexp.match('kokudori', 'who is kodkuri?') | |
p MyRegexp.match('kokudori', 'No, he is kokudori') | |
#---------------結果------------------ | |
false | |
true |
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