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46 lines
1.3 KiB
Markdown
46 lines
1.3 KiB
Markdown
---
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title: substr
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# linktitle:
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description: Extracts parts of a string from a specified character's position and returns the specified number of characters.
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godocref:
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2017-02-01
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categories: [functions]
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menu:
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docs:
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parent: "functions"
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keywords: [strings]
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aliases: []
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signature: ["substr STRING START [LENGTH]"]
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workson: []
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hugoversion:
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relatedfuncs: []
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deprecated: false
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---
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It normally takes two parameters: `start` and `length`. It can also take one parameter: `start`, i.e. `length` is omitted, in which case the substring starting from start until the end of the string will be returned.
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To extract characters from the end of the string, use a negative start number.
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In addition, borrowing from the extended behavior described at https://php.net substr, if `length` is given and is negative, that number of characters will be omitted from the end of string.
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```
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{{ substr "abcdef" 0 }} → "abcdef"
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{{ substr "abcdef" 1 }} → "bcdef"
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{{ substr "abcdef" 0 1 }} → "a"
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{{ substr "abcdef" 1 1 }} → "b"
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{{ substr "abcdef" 0 -1 }} → "abcde"
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{{ substr "abcdef" 1 -1 }} → "bcde"
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{{ substr "abcdef" -1 }} → "f"
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{{ substr "abcdef" -2 }} → "ef"
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{{ substr "abcdef" -1 1 }} → "f"
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{{ substr "abcdef" -2 1 }} → "e"
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{{ substr "abcdef" -3 -1 }} → "de"
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{{ substr "abcdef" -3 -2 }} → "d"
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```
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