24 lines
837 B
Markdown
24 lines
837 B
Markdown
---
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title: URLJoin
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tags: string,utility,regexp,advanced
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---
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Joins all given URL segments together, then normalizes the resulting URL.
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Use `String.prototype.join('/')` to combine URL segments, then a series of `String.prototype.replace()` calls with various regexps to normalize the resulting URL (remove double slashes, add proper slashes for protocol, remove slashes before parameters, combine parameters with `'&'` and normalize first parameter delimiter).
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```js
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const URLJoin = (...args) =>
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args
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.join('/')
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.replace(/[\/]+/g, '/')
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.replace(/^(.+):\//, '$1://')
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.replace(/^file:/, 'file:/')
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.replace(/\/(\?|&|#[^!])/g, '$1')
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.replace(/\?/g, '&')
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.replace('&', '?');
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```
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```js
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URLJoin('http://www.google.com', 'a', '/b/cd', '?foo=123', '?bar=foo'); // 'http://www.google.com/a/b/cd?foo=123&bar=foo'
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``` |