▼Mz Lib: Legacy Racket Libraries
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awk
match: start
match: end
match: substring
regexp-exec
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 (require mzlib/awk)

(awk next-record-expr
     (record field-id ...)
     maybe-counter
     ((state-variable init-expr) ...)
     maybe-continue
  clause ...)
 
maybe-counter = 
  | id
     
maybe-continue = 
  | id
     
clause = (test body ...+)
  | (test => procedure-expr)
  | (/ regexp-str / (id-or-false ...+) body ...+)
  | (range excl-start-test excl-stop-test body ...+)
  | (:range incl-start-test excl-stop-test body ...+)
  | (range: excl-start-test incl-stop-test body ...+)
  | (:range: incl-start-test incl-stop-test body ...+)
  | (else body ...+)
  | (after body ...+)
     
test = integer
  | regexp-string
  | expr
     
excl-start-test = test
     
excl-stop-test = test
     
incl-start-test = test
     
incl-stop-test = test
     
id-or-false = id
  | #f
The awk macro from Scsh [Shivers06]. In addition to awk, the Scsh-compatible procedures match:start, match:end, match:substring, and regexp-exec are defined. These match: procedures must be used to extract match information in a regular expression clause when using the => form.

(match:start rec [which]) → exact-nonnegative-integer?
  rec : ....
  which : exact-nonnegative-integer? = 0
(match:end rec [which]) → exact-nonnegative-integer?
  rec : ....
  which : exact-nonnegative-integer? = 0
(match:substring rec [which]) → string?
  rec : ....
  which : exact-nonnegative-integer? = 0
Extracts a start position, end position, or substring corresponding to a match. The first argument is the value supplied to the procedure after => in a awk clause or the result of regexp-exec.

(regexp-exec re s) → (or/c .... false/c)
  re : (or/c string? regexp?)
  s : string?
Matches a regexp to a string, returning a record compatible with match:start, etc.

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