正则表达式在Kotlin中不匹配 [英] Regex doesn't match in Kotlin

问题描述

我不明白为什么这个简单的正则表达式不匹配任何东西.它总是失败并引发异常:

I can't understand why this simple regex doesn't match anything. It always fails and throws exception:

    val match = Regex("""\d+""").matchEntire("A123B")?: throw Exception("Regex fail")

推荐答案

您要使整个输入与

You want to match an entire input with matchEntire and a \d+ pattern:

fun matchEntire(input: CharSequence): MatchResult? (source)
尝试将整个输入CharSequence与该模式进行匹配.
如果整个输入匹配，则返回MatchResult的一个实例；否则返回null.

fun matchEntire(input: CharSequence): MatchResult? (source)
Attempts to match the entire input CharSequence against the pattern.
Return An instance of MatchResult if the entire input matches or null otherwise.

但是，A123B不仅由数字组成.如果需要查找部分匹配项，请使用 .

However, A123B does not only consist of digits. If you need to find a partial match, use find.

这篇关于正则表达式在Kotlin中不匹配的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！