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RegEx to allow letters numbers and spaces but not two spaces in a row

原文 2016-04-27 22:45:18 7 2 javascript/ php/ regex

Hello I have a RegEx that allows up to 18 characters with numbers, letters and spaces only.

How can I modify this to check if the string is starting with a space, or has two spaces in a row?

/^[0-9A-Za-z\s]{1,18}$/

I am using this regex in both native javascript (not jquery) and PHP.

2 answers

您可以使用否定前瞻来检查字符串是否以空格开头或是否有 2 个或更多连续空格，例如：

^(?!.*\s{2,})(?!^ )[0-9A-Za-z\s]{1,18}$

(?:(?![ ]{2}).)+

use this regex. This may solve your problem.

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