正则表达式:只匹配一次 [英] Regex: Matching exactly one occurrence

问题描述

我需要一个正则表达式来精确匹配一个花括号对:

I need a regex that matches exactly one occurrence of a curly brace pair:

myString_{1-10}         -> match
myString_{hello}_xyz    -> match
myString_{1-10}_{hello} -> do not match

这是我的正则表达式:

(\{)[^}]*(\})

问题是我的正则表达式还匹配包含多个大括号对的字符串......我错过了什么?

The problem is that my regex also matches strings containing more than one occurrence of curly brace pairs... what am I missing?

推荐答案

你可以使用这个:

^[^{}]*\{[^}]*\}[^{}]*$

说明:

^[^{}]*    // Match 0 or more occurrences of character other than [{}]
 \{        // Match a `{`
 [^}]*     // Match 0 or more occurrences of character other than }
 \}        // Match a `}`
 [^{}]*$   // Match 0 or more occurrences of character other than [{}]

您也需要处理嵌套的大括号或不匹配的大括号

You need to take care of nested braces or unmatched braces too

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