How do I write a regular expression that matches strings with exactly one space between each word and no trailing or leading spaces? The string can - apart from letters - contain only [-.,'] characters and no consecutive spaces between words.How do I write a regular expression that matche
阅读背景：
正则表达式，匹配字符串，每个单词之间只有一个空格，没有尾随或前导空格
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