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card_7746.txt
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1990-08-28
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-- card: 7746 from stack: in
-- bmap block id: 0
-- flags: 0000
-- background id: 2685
-- name: Regular Expressions
-- part contents for background part 9
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DemoStack 0.9
-- part contents for background part 1
----- text -----
Regular Expressions
-- part contents for background part 12
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Card #8
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Research is used for searching for a pattern in either a single input string, or in a list of containers, which may be in more than one card.
REGULAR EXPRESSIONS
Following is a brief summary of the regular expressions understood by Research.
c match character c
\c take away special meaning of c
[...] characters in [...]; ranges like a-z
[^...] characters not in [...]; ranges like a-z
^r anchor to start of line
r$ anchor to end of line
r* zero more times
r+ one or more times
r? zero or one time
r{n} repeat n times
r{n,} repeat n times or more
r{,m} repeat 0 to m times
r{n,m} repeat n to m times
\(r\) tag expression
\n refer to n'th tagged expression
r1|r2 expression r1 or r2
(r) group expression
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Description