rex

The rex: operator defines a function expressed in the previously described regular expression syntax. The regular expression proper is preceded and followed by an arbitrary delimiter character, which may be any printing character desired.

The resulting function accepts a single string as input and returns at minimum a boolean flag indicating whether or not the string was successfully matched.

Stack:
rex: myfn /^ab*c$/
Stack:
"abc" myfn
Stack: t
pop "ad" myfn
Stack: nil

If there are any parentheses in the regular expression, the function in addition returns one string value for each parenthesis pair, giving the substring matched by that parenpair.

Stack:
rex: myfn /^a(b*)c$/
Stack:
"abbbc" myfn
Stack: t "bbb"
pop pop "ad" myfn
Stack: nil ""

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