需要PHP preg_match，以确保单词之间仅允许一个空格字符 [英] PHP preg_match needed to ensure only ONE space character is allowed between words

问题描述

基本上，我需要一个preg_match，以确保每个单词之间只能有一个空格字符(如果有多个单词).

basically I need a preg_match that ensures that only one space character is allowed between each word (IF there is more than one word).

我现有的规则是:

(^[A-Za-z\s]+$)

谢谢.

推荐答案

这取决于您单词"的含义，但是假设您使用A-Z或a-z字母表示，则可以尝试以下操作:

It depends what you mean by "word", but assuming you mean letters in A-Z or a-z you can try this:

^[a-zA-Z]+( [a-zA-Z]+)*$

请注意，\s并非 表示空格字符-表示任何空格，包括换行符.

Note that \s does not mean the space character - it means any whitespace, including a new line.

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