用于修剪字母/单词的正则表达式，如果前面有2个空格

Could you please help with preg_replace regex for trimming letter/words if appears after 2 or more white spaces? i.e.:

lorem ipsum  x

to become

lorem ipsum

also would be great to left trim if word/letter followed by 2 white spaces i.e.

x  lorem ipsum

The following should match 2 or more whitespaces, followed by any number of consecutive "word" characters

$rx = "/\s{2,}\w*/";

Here's the regex that will match the criteria you described (note the leading spaces may be hard to see):

  \w+?\b

Demo: http://gskinner.com/RegExr/?2ucpq

Edit: looks like to make this actually work in PHP, you need leading and trailing slashes:

preg_replace('/  \w+?\b/','','testing pro  x');