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+---
+title: strings.Substr
+linkTitle: substr
+description: Extracts parts of a string from a specified character's position and returns the specified number of characters.
+categories: [functions]
+keywords: []
+menu:
+  docs:
+    parent: functions
+function:
+  aliases: [substr]
+  returnType: string
+  signatures: ['strings.Substr STRING START [LENGTH]']
+relatedFunctions: []
+aliases: [/functions/substr]
+---
+
+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.
+
+To extract characters from the end of the string, use a negative start number.
+
+If `length` is given and is negative, that number of characters will be omitted from the end of string.
+
+```go-html-template
+{{ substr "abcdef" 0 }} → "abcdef"
+{{ substr "abcdef" 1 }} → "bcdef"
+
+{{ substr "abcdef" 0 1 }} → "a"
+{{ substr "abcdef" 1 1 }} → "b"
+
+{{ substr "abcdef" 0 -1 }} → "abcde"
+{{ substr "abcdef" 1 -1 }} → "bcde"
+
+{{ substr "abcdef" -1 }} → "f"
+{{ substr "abcdef" -2 }} → "ef"
+
+{{ substr "abcdef" -1 1 }} → "f"
+{{ substr "abcdef" -2 1 }} → "e"
+
+{{ substr "abcdef" -3 -1 }} → "de"
+{{ substr "abcdef" -3 -2 }} → "d"
+```