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#() reader macro |
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Several functions are provided to print objects to the output stream that is
the current value of *out*. The -str versions bind *out*
to a StringWriter, print to that, and return the resulting
string.
pr
prints the object(s), separated by spaces if there is more than
one.
prn
does the same and follows it with a
newline.
print
and
println
call
pr
and
prn
respectively, with *print-readably* (which defaults to true) bound
to nil, which causes strings to print without surrounding quotes or any
escape character encoding, and characters to print without the leading '\',
or any escape character encoding. By default,
pr
and
prn
print in a way that objects can be read by the reader, while
print
and
println
produce output for human consumption. When *print-readably* is
non-nil, the printing of metadata is toggled by *print-meta*, which
defaults to nil.
Print to *out*:
pr
prn
print
println
newline
Print to string:
pr-str
prn-str
print-str
println-str
with-out-str
Regex patterns can be compiled at read-time via the #"pattern" reader
macro, or at run time with
re-pattern.
Both forms produce
java.util.regex.Pattern
objects.
user=> (re-seq #"[0-9]+" "abs123def345ghi567")
("123" "345" "567")
user=> (re-find #"([-+]?[0-9]+)/([0-9]+)" "22/7")
["22/7" "22" "7"]
user=> (let [[a b c] (re-matches #"([-+]?[0-9]+)/([0-9]+)" "22/7")]
[a b c])
["22/7" "22" "7"]
user=> (re-seq #"(?i)[fq].." "foo bar BAZ QUX quux")
("foo" "QUX" "quu")