php中的正则表达式:取最短匹配 [英] regular expression in php: take the shortest match

问题描述

我正在尝试做一个 PHP 正则表达式，但我找不到正确的方法......

I'm trying to do a PHP regular expression but i can't find the right way ...

想象一下我有这个字符串:你好，我的{{name is Peter}}和{{我想吃巧克力}}"

Imagine I have this string: "hello, my {{name is Peter}} and {{I want to eat chocolate}}"

我想取{{和}}之间的部分

I want to take the parts between {{ and }}

但是如果我使用 preg_match("/\{\{(.*)?\}\}/", $string)

它只返回一个字符串{{name is Peter}} 和{{我想吃巧克力}}"

it returns me jut one string "{{name is Peter}} and {{I want to eat chocolate}}"

我怎样才能判断出}} 的第一个巧合?

How can I tell to take the first coincidences of }} ?

谢谢

推荐答案

使用

"/{{(.*?)}}/"

表达式 ".*" 是贪婪的，取尽可能多的字符.如果您使用 ".*?" 则需要尽可能少的字符，即它停在第一组右括号处.

The expression ".*" is greedy, taking as many characters as possible. If you use ".*?" is takes as little characters as possible, that is it stops at the first set of closing brackets.

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