4.19 Regular Expressions

The :std/pregexp library provides the Dorai Sitaram’s well known portable Scheme regular expression library.

See the pregexp page for details of the regular expression language and examples.

usage

(import :std/pregexp)

4.19.1 pregexp

(pregexp regexp)
  regexp := string; the regular expression
-> <pregexp>

Parse a string and compile it to a regular expression.

4.19.2 pregexp-match

(pregexp-match pat str [start #f] [end #f])
  pat := <pregexp> or string; the regular expression to match
  str := the string to match
  start := start position in the string
  end := end position in the string
-> list or #f

Match a string against a regular expression and return a list of matching substrings.

4.19.3 pregexp-match-positions

(pregexp-match-positions pat str [start #f] [end #f])
  pat := <pregexp> or string; the regular expression to match
  str := the string to match
  start := start position in the string
  end := end position in the string
-> list or #f

Match a string against a regular expression and return a list of index pairs where matches have occurred.

4.19.4 pregexp-split

(pregexp-split pat str)
  pat := <pregexp> or string; the regular expression to match
  str := the string to match
-> list

Split a string using a regular expression as delimiter and return a list of matching substrings.

4.19.5 pregexp-replace

(pregexp-replace pat str ins)
  pat := <pregexp> or string; the regular expression to match
  str := the string to match
  ins := the string to insert
=> string

Replace the portion of a string matched by regular expression with another string.

4.19.6 pregexp-replace*

(pregexp-replace* pat str ins)
  pat := <pregexp> or string; the regular expression to match
  str := the string to match
  ins := the string to insert
=> string

Like pregexp-replace but replaces all occurrences of the pattern

4.19.7 pregexp-quote

(pregexp-quote str)
  str := a string
=> string

Takes an arbitrary string and returns a string regular expression that represents it precisely.