不匹配 spec.ts 和 spec.tsx 但应该匹配任何其他 .ts 和 .tsx 的正则表达式 [英] Regex that doesn't match spec.ts and spec.tsx but should match any other .ts and .tsx

问题描述

我写的这个正则表达式匹配任何 .ts 或 .tsx 文件名，但不应该匹配 spec.tsx 或 spec.ts.下面是我写的正则表达式.

I wrote this regex that matches any .ts or .tsx file names but shouldn't match spec.tsx or spec.ts. Below is the regex I wrote.

(?!spec)\.(ts|tsx)$

但它无法忽略.spec.tsx 和spec.ts 文件.我在这里做错了什么?请指教.

But it fails to ignore.spec.tsx and spec.ts files. What am I doing wrong here? Please advice.

推荐答案

否定前瞻语法 ((?!...)) 从任何位置看起来ahead在正则表达式中.因此，您的 (?!spec) 正在与该点之后的内容进行比较，就在 \. 之前.换句话说，它与文件扩展名 .ts 或 .tsx 进行比较.否定前瞻不匹配，因此整个字符串不会被拒绝为匹配项.

The negative lookahead syntax ((?!...)) looks ahead from wherever it is in the regex. So your (?!spec) is being compared to what follows that point, just before the \.. In other words, it's being compared to the file extension, .ts or .tsx. The negative lookahead doesn't match, so the overall string is not rejected as a match.

你想要一个否定的lookbehind正则表达式:

You want a negative lookbehind regex:

(?<!spec)\.(ts|tsx)$

这是一个演示(请参阅单元测试"链接在屏幕左侧).

Here's a demo (see the "unit tests" link on the left side of the screen).

以上假设您的正则表达式风格支持负向后视；并非所有的正则表达式都可以.如果您碰巧使用了不支持负向后视的正则表达式，则可以使用更复杂的负向后视:

The above assumes that your flavor of regex supports negative lookbehinds; not all flavors of regex do. If you happen to be using a regex flavor that doesn't support negative lookbehinds, you can use a more complex negative lookahead:

^(?!.*spec\.tsx?$).*\.tsx?$

这实际上是说，从头开始，确保字符串不以 spec.ts 或 spec.tsx 结尾.如果不是't 以那个结尾，然后匹配它是否以 .ts 或 .tsx"

This says, in effect, "Starting from the beginning, make sure the string doesn't end in spec.ts or spec.tsx. If it doesn't end in that, then match if it ends in .ts or .tsx"

演示

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