输入英文和空格的正则表达式
    ### English Response:
    English & Whitespace Regular Expression.
    The following regular expression matches English letters (a-z and A-Z) and whitespace characters:
    [a-zA-Z\s]
    This regex can be used to perform various text processing tasks, such as:
js正则表达式验证数字和字母    Filtering out non-English characters and whitespace: To remove all non-English characters and whitespace from a string, you can use the following regex:
    [^\w\s]
    Extracting English words from a string: To extract all English words from a string, you can use the following regex:
    [a-zA-Z]+。
    Splitting a string into English words: To split a string into an array of English words, you can use the following regex:
    [a-zA-Z]+(\s+[a-zA-Z]+)。
    Example Usage.
    Here are some examples of how the English & Whitespace regular expression can be used:
    # Remove all non-English characters and whitespace from a string.
    input_string = "Hello, world! こんにちは世界"
    result = input_string.gsub(/[^a-zA-Z\s]/, "")。
    # result: "Hello world!"
    # Extract all English words from a string.
    input_string = "Hello, world! こんにちは世界"
    result = input_string.scan(/[a-zA-Z]+/)。
    # result: ["Hello", "world"]
    # Split a string into English words.
    input_string = "Hello, world! こんにちは世界"
    result = input_string.split(/[a-zA-Z]+(\s+[a-zA-Z]+)/)。
    # result: ["Hello", ",", "world", "!", "こんにちは", "世界"]
    ### Chinese Response:
    英文和空格正则表达式。
    以下正则表达式匹配英文字母(a-z 和 A-Z)和空格字符:
    [a-zA-Z\s]
    这个正则表达式可用于执行各种文本处理任务,例如:
    过滤掉非英文字符和空格: 要从字符串中删除所有非英文字符和空格,可以使用以下正则表达式:
    [^\w\s]
    从字符串中提取英文词语: 要从字符串中提取所有英文词语,可以使用以下正则表达式:
    [a-zA-Z]+。
    将字符串拆分为英文词语: 要将字符串拆分为英文词语数组,可以使用以下正则表达式:

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