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40 lines
1.2 KiB
Markdown
40 lines
1.2 KiB
Markdown
---
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title: 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: [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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signature:
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- "substr STRING START [LENGTH]"
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- "strings.Substr STRING START [LENGTH]"
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relatedfuncs: []
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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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