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# sub_str
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Returns the part of the string from `begin` to `end` , or to the `end` of the string (`end` not included).
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## Parameters
- `t` : The original string.
- `begin` : The beginning index, inclusive.
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- `end` : The ending index, exclusive. If it's omitted, the substring begins with the character at the specified `begin` and extends to the end of the original string.
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## Examples
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use < util / sub_str . scad >
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assert(sub_str("helloworld", 0, 5) == "hello");
assert(sub_str("helloworld", 5) == "world");
