PHP 正则表达式用   替换空格如果它跟随单个字母

问题描述

我有用户定义的字符串(要保存并在网络中使用的 html 格式的字符串)，并且需要找到一种方法来用   替换单个字母之后的每个空格.

I have user defined string (html formated string to be saved and used in web) and need to find a way to replace each white space which is right after a single letter by  .

例如 "this is a string" 应该变成 "this is a string",

For example "this is a string" should become "this is a string",

"bla bla bl abla b la blabla" 应该变成 "bla bla b l abla b la blabla" ...等等……

"bla bla b l abla b la blabla" should become "bla bla b l abla b la blabla" ...etc...

推荐答案

preg_replace('/(?<=\b[a-z]) /i', '&nbsp;', $s);

此处的正则表达式执行正向后视确保空格前面是单个字母和单词边界.

The regular expression here performs a positive lookbehind which ensures that the space is preceded by a single letter and a word boundary.

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