Concept:RegularExpression

Most Scheme implementations come with some sort of regular expression matcher, but the interface varies a lot.

• The language it accepts: POSIX, GNU regex library, Perl-compatible library, SRE, or original.
• Whether it has disjoint regexp object, or just uses string to represent regexp.
• The return type of match. substring? indexes? or a special match object?
• If it has regexp object, whether it supports literal representation of regexp or not.
• Procedure names to match.

Chicken

• language: GNU regex
• regexp object: Yes
• return type of match: substring, indexes.
• API: string-match, string-match-positions, string-search, string-search-positions, string-split-fields, string-substitute.

Scheme48

• language: built by funcional style
• regexp object: Yes (mixed with character set object)
• return type of match:
• API: set, range, ranges, ascii-range, ascii-ranges, negate, intersection, union, subtract, lower-case, upper-case, alphabetic, numeric, alphanumeric, punctuation, graphic, printing, control, blank, whitespace, hexdigit, string-start, string-end, sequence, one-of, text, repeat, ignore-case, use-case, submatch, no-submatches, any-match?, exact-match?, match, match-start, match-end, match-submatches

Gauche

• language: original (similar to POSIX, with some restrictions and extensions).
• regexp object: Yes
• return type of match: regmatch object
• literal representation: #/regexp/, see #/.
• API: regexp?, string->regexp, rxmatch, rxmatch-start, rxmatch-end, rxmatch-substring, rxmatch-before, rxmatch-after, rxmatch-if, rxmatch-let, rxmatch-cond, rxmatch-case, regexp-replace, regexp-replace-all, regexp-quote

MzScheme

• language: egrep, Perl-compatible
• regexp object: Yes
• return type of match: substring, indexes.
• literal representation: #rx"regexp" (regexp), #rx#"regexp" (byte-regexp), #px"regexp" (pregexp), #px#"regexp" (byte-pregexp)
• API: regexp?, pregexp?, regexp?, pregexp??, byte-regexp?, byte-pregexp?, byte-regexp??, byte-pregexp??, regexp-match, regexp-match-positions, regexp-match??, regexp-match-peek?, regexp-match-peek-positions?, regexp-match-peek-immediate?, regexp-match-peek-positions-immediate?, regexp-replace, regexp-replace*?

STklos

• language: Perl-compatible
• regexp object: Yes
• return type of match: substring, indexes
• literal representation: No.
• API: string->regexp, regexp?, regexp-match, regexp-match-positions, regexp-replace, regexp-replace-all, regexp-quote

LIPS

• langauge: JavaScript (except no spaces inside)
• regexp object: Yes
• literal expressions: /foo|bar/
• API: match, search, split functions or invoking methods on strings with --> macro like in Javascript