php - regex for 4 letter word of particular occurance

Question

I am interested in regex for finding the following pattern.

I or E for the 1st letter, N or S 2nd, F or T 3rd, and J or P 4th.

This would identify ISTJ, ESTP,ENTP but not EJPT.

Thanks

Answer 1

应该很简单，使用Character Sets：[IE][NS][FT][JP]

对于整个单词：\b[IE][NS][FT][JP]\b
对于整个输入：^[IE][NS][FT][JP]$

工作示例：http ://rubular.com/r/6VCwduNiTX

示例 PHP 代码：http: //ideone.com/XgbFWY

$ptn = "/[IE][NS][FT][JP]/"; // use "/[IE][NS][FT][JP]/i" to ignore case
$str = "ISTJ, ESTP,ENTP but not EJPT";
preg_match_all($ptn, $str, $matches);