Splitting a string

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Splitting a string

How to split a string based on specific separators?
By separator - s.split("separator")
By whitespace - s.split_whitespace()
By newlines - s.lines()
How to split a string based on multiple characters?
Standard library split can be used with a closure to fulfill this use case.
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fn split_stuff() {
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    let message = "Hello there | how are you ; doing?";
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    for s in message.split(|c| (c == '|') || (c == ';')) {
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        dbg!(s);
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    }
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}
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Output would be as follows,
s = "Hello there " s = " how are you " s = " doing?"
To get rid of spaces, trim() method can be used.
Although it is possible to write a closure to split on arbitrarily complex conditions, it easier to use regex crate for splitting based on regular expressions.
Another approach without using a closure would be to make use of string slice patterns. As an example, we can write the above split as,
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for s in message.split(&['|', ';'][..]) {
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// ...
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}
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Splits can be collected to a vector and other types of Rust collections with collect method.
How to split a string based on regular expressions?
Splitting a string such as "hello there; how| are|you, chathura" based on multiple characters and taking into account multiple spaces is not simple without using regular expressions.
Following solution demonstrates the use of regex crate to accomplish the task.
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fn split_by_regex() {
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    let message = "hello there; how|    are|you, Chathura";
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​
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    let re = regex::Regex::new(r"[;,|\s]\s*").unwrap();
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​
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    for s in re.split(message) {
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        dbg!(s);
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    }
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}
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Text Processing

Converting a string to vectors and back

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Contents

How to split a string based on specific separators?

How to split a string based on multiple characters?

How to split a string based on regular expressions?