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| pattern | value-end, =| | ||||||||
Syntax
value-end
value-end is a positional pattern recognized at the end of a scanned value.
Two forms of the value-end pattern are available - the long form and the short form, =|. You should use whatever form leads to the most readable code. For instance, in the following do scan (where every match alternative is guarded by a value-end to ensure that only whole values are matched) it is clearly preferable to use the short form:
do scan cgi-data{"PATH_INFO"}
drop ~cgi-data{"SCRIPT_NAME"}
match "/login" =|
login-page
match "/guess" =|
guess-page
else
new-page
done
But in the following match statement (that matches any characters up to the next comma or the end of the text), the long form is clearly preferable:
match any** ("," | value-end)
The short form next to the "or" operator (|)would make a pattern that was hard to read:
match any** ("," | =|)
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Related Syntax do scan repeat scan |
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