Regular expressions<#703#>regular expression<#703#> are first class objects in
<#704#><#704#>. A regular expression is created by the <#705#>string-;SPMgt;regexp<#705#>
procedure. Matching a regular expression against a string is simply done by
applying a previously created regular expression to this string.
Regular expressions are implemented using code in the Henry Spencer's
package, and much of the description of regular expressions below is copied
from his manual.
#entry706#
#entry749#
#entry760#