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39 lines
1.1 KiB
Markdown
39 lines
1.1 KiB
Markdown
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---
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title: strings.Substr
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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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categories: []
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keywords: []
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action:
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aliases: [substr]
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related: []
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returnType: string
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signatures: ['strings.Substr STRING START [LENGTH]']
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aliases: [/functions/substr]
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---
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It normally takes two argument: `start` and `length`. It can also take one argument: `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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If `length` is given and is negative, that number of characters will be omitted from the end of string.
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```go-html-template
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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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