Given a string, what methods are available for checking a specific region of a given string for certain characters? For example, checking the first three characters of a string for vowels, or consonants. Given a string, what methods are available for
阅读背景：
检查任何字符串的某个部分是否有某些字符，然后将这些特定字符移动到字符串的不同部分（Ruby 2.3.3）
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