这两个有什么区别（String#scan and String#split）在红宝石中？
它们服务于完全不同的目的。String#scan http://www.ruby-doc.org/core-1.9.3/String.html#method-i-scan用于从字符串中提取正则表达式的匹配项并将匹配项返回到数组中，而String#split http://www.ruby-doc.org/core-1.9.3/String.html#method-i-split旨在根据分隔符将字符串拆分为数组。分隔符可以是静态字符串（例如;以单个分号分割）或正则表达式（例如/\s/+分割任何空白字符）。
的输出String#split不包括分隔符。相反，除了分隔符之外的所有内容都将在输出数组中返回，而String#scan would only包括与分隔符匹配的内容。
# A delimited string split on | returns everything surrounding the | delimiters
"a|delimited|string".split("|")
# Prints: ["a", "delimited", "string"]
# The same string scanninng for | only returns the matched |
"a|delimited|string".scan("|")
# Prints: ["|", "|"]
上述两者也都接受正则表达式来代替简单字符串"|".
# Split on everything between and including two t's
"a|delimited|string".split(/t.+t/)
# Prints: ["a|delimi", "ring"]
# Search for everything between and including two t's
"a|delimited|string".scan(/t.+t/)
# Prints: ["ted|st"]
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