Regex

Regular expression functions for pattern matching, searching, and replacement. Patterns use Rust regex syntax.

Matching

regex/match?

Test if a pattern matches anywhere in a string. Returns #t or #f.

(regex/match? "\\d+" "abc123")     ; => #t
(regex/match? "\\d+" "no digits")  ; => #f

regex/match

Match a pattern and return the full match plus any capture groups as a list. Returns #f if no match.

(regex/match "^(\\w+)@(\\w+)" "user@host")
; => ("user@host" "user" "host")

(regex/match "(\\d+)-(\\d+)" "2025-01")
; => ("2025-01" "2025" "01")

(regex/match "xyz" "abc")
; => #f

regex/find-all

Find all non-overlapping matches of a pattern.

(regex/find-all "\\d+" "a1b2c3")    ; => ("1" "2" "3")
(regex/find-all "[A-Z]" "Hello World")  ; => ("H" "W")

Replacement

regex/replace

Replace the first match of a pattern.

(regex/replace "\\d" "a1b2" "X")   ; => "aXb2"

regex/replace-all

Replace all matches of a pattern.

(regex/replace-all "\\d" "a1b2" "X")   ; => "aXbX"
(regex/replace-all "\\s+" "a  b  c" " ")  ; => "a b c"

Splitting

regex/split

Split a string by a regex pattern.

(regex/split "," "a,b,c")          ; => ("a" "b" "c")
(regex/split "\\s+" "hello  world")  ; => ("hello" "world")