替换除正/负数以外的所有内容 [英] Replace everything except positive/negative numbers

问题描述

已经回答了许多问题来替换所有正数.但是，我找不到任何保留正数和负数的答案.我想替换所有不是数字(正数或负数)的东西.输出应如下，例如.

There are many questions already answered for replacing everything positive numbers. But, I couldn't find any answer which preserves both positive and negative numbers. I want to replace everything that isn't number(positive or negative). The output should be the following eg.

<代码>0 |成功.id - 1234| -> 0 1234

和

<代码>-10 |失败.id - 2345| -> -10 2345

显然这回答了积极的部分.

Apparently this answers for the positive part.

推荐答案

您可以使用此正则表达式来匹配正/负整数:

You can use this regex to match positive/negative integers:

[+-]?\b\d+\b

正则表达式演示

匹配包括小数在内的正/负数:

to match positive/negative numbers including decimals:

[+-]?\b\d+(?:\.\d+)?\b

请注意，与其使用替换，不如在 Pattern 和 Matcher API 中使用上述正则表达式，然后获取匹配的数据.

Please note that rather than using replace you would be better off using above regex in Pattern and Matcher APIs and just get your matched data.

如果您只能使用替换，请使用:

In case you can only use replace then use:

str = str.replaceAll( "([+-]?\\b\\d+\\b)|\\S+[ \\t]*", "$1" );

替换演示

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