Question 1

How do I install cl-str with Quicklisp?

Accepted Answer

Run (ql:quickload :str) in your Common Lisp environment. It's also available on Ultralisp and other distributions. Ensure Quicklisp is set up, or use Portacle for a full development environment.

Question 2

cl-str vs alexandria for string manipulation: which should I use?

Accepted Answer

cl-str is specialized for strings with a consistent API and fixes for built-in quirks, while alexandria is a general utility library. Choose cl-str for comprehensive string operations, but alexandria if you need broader utilities beyond strings.

Question 3

How to handle nil values safely in cl-str functions?

Accepted Answer

cl-str automatically returns nil for nil inputs in functions like downcase, avoiding conversion to 'nil'. This is a core fix over built-ins, making error handling more intuitive without extra checks.

Question 4

Does cl-str support Unicode and international characters?

Accepted Answer

Yes, it includes functions like lettersp and lettersnump for Unicode letters, and case conversion adapts to Unicode. However, support depends on the underlying Lisp implementation, so test for specific edge cases.

Question 5

What are the performance implications of using cl-str?

Accepted Answer

While not explicitly benchmarked, cl-str adds a layer over built-in functions, which may introduce minor overhead. For most applications, this is negligible, but performance-critical code should profile and compare with raw built-ins.

Question 6

How to split a string with a regular expression in cl-str?

Accepted Answer

Use the split function with the :regex t keyword argument. For example, (str:split '[,|;]' 'foo,bar;baz' :regex t) returns ('foo' 'bar' 'baz'), allowing complex pattern matching seamlessly.

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