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|
The `replace()` function replaces the given regular expression or plain
string pattern on the given subject value with the specified replacement.
In case a regular expression with the global (`g`) modifier set or a
string is passed as pattern, all found occurrences are replaced. In case
a regular expression without global modifier is given, only the first
match will be replaced.
The replacement value may be either a string, which is inserted in place
of the matched result after certain interpolation steps or a function
which is invoked for each match and whose return value is used as
replacement.
The subject is implicitly converted to a string if it is not a string.
The pattern is implicitly converted to a string if it is neither a string
nor a regular expression value.
The replacement value is implicitly converted to a string if it is neither
a string nor a function value.
Returns a copy of the input string with the match(es) replaced by their
corresponding replacement values.
Returns `null` either the subject, the pattern or the replacement value
is `null`.
-- Testcase --
{%
print(join("\n###\n", [
// Capitalize and reformat all key=value pairs using a callback
replace("kind=fruit name=strawberry color=red",
/([[:alpha:]])([[:alpha:]]*)=(.)([^= ]*) */g,
function(m, letter1, rest1, letter2, rest2) {
return sprintf('%s%s: %s%s\n',
uc(letter1), rest1,
uc(letter2), rest2
);
}),
// strike any three letter word
replace("The quick brown fox jumps over the lazy dog",
/(^| )([[:alpha:]]{3})( |$)/g,
"$1<s>$2</s>$3"),
// highlight any vowel
replace("The quick brown fox jumps over the lazy dog",
/[aeiou]/g,
"[$&]"),
// replace with fixed pattern
replace("foo bar foo baz foo qrx", "foo", "xxx"),
// testing all possible replacement interpolations
replace("before abc def ghi jkl mno pqr stu vwx yz! after",
/ ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z!]{3}) /,
'|\n---\n' +
'Entire match ($$&): [$&]\n' +
'Before match ($$`): [$`]\n' +
"After match ($$'): [$']\n" +
'Group 1 match ($$1): [$1]\n' +
'Group 2 match ($$2): [$2]\n' +
'Group 3 match ($$3): [$3]\n' +
'Group 4 match ($$4): [$4]\n' +
'Group 5 match ($$5): [$5]\n' +
'Group 6 match ($$6): [$6]\n' +
'Group 7 match ($$7): [$7]\n' +
'Group 8 match ($$8): [$8]\n' +
'Group 9 match ($$9): [$9]\n' +
'Literal $$: [$$]\n' +
'---\n|'),
// testing that all captures are passed to the callback
replace("before abc def ghi jkl mno pqr stu vwx yz! after",
/ ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z]{3}) ([a-z!]{3}) /,
function(m0, m1, m2, m3, m4, m5, m6, m7, m8, m9) {
return sprintf(
'|\n---\n' +
'Entire match (arg 0): [%s]\n' +
'Group 1 match (arg 1): [%s]\n' +
'Group 2 match (arg 2): [%s]\n' +
'Group 3 match (arg 3): [%s]\n' +
'Group 4 match (arg 4): [%s]\n' +
'Group 5 match (arg 5): [%s]\n' +
'Group 6 match (arg 6): [%s]\n' +
'Group 7 match (arg 7): [%s]\n' +
'Group 8 match (arg 8): [%s]\n' +
'Group 9 match (arg 9): [%s]\n' +
'---\n|',
m0, m1, m2, m3, m4, m5, m6, m7, m8, m9
);
}),
// the subject is implictly stringified
replace({ foo: true }, "foo", "xxx"),
// the pattern is implictly stringified
replace({ foo: true }, true, "false"),
// the replacement is implictly stringified
replace({ foo: true }, "foo", 0x7b),
// special case: replace all empty matches
replace("foo", "", "."),
replace("foo", /()/g, ".")
]), "\n");
%}
-- End --
-- Expect stdout --
Kind: Fruit
Name: Strawberry
Color: Red
###
<s>The</s> quick brown <s>fox</s> jumps over <s>the</s> lazy <s>dog</s>
###
Th[e] q[u][i]ck br[o]wn f[o]x j[u]mps [o]v[e]r th[e] l[a]zy d[o]g
###
xxx bar xxx baz xxx qrx
###
before |
---
Entire match ($&): [ abc def ghi jkl mno pqr stu vwx yz! ]
Before match ($`): [before ]
After match ($'): [ after]
Group 1 match ($1): [abc]
Group 2 match ($2): [def]
Group 3 match ($3): [ghi]
Group 4 match ($4): [jkl]
Group 5 match ($5): [mno]
Group 6 match ($6): [pqr]
Group 7 match ($7): [stu]
Group 8 match ($8): [vwx]
Group 9 match ($9): [yz!]
Literal $: [$]
---
| after
###
before |
---
Entire match (arg 0): [ abc def ghi jkl mno pqr stu vwx yz! ]
Group 1 match (arg 1): [abc]
Group 2 match (arg 2): [def]
Group 3 match (arg 3): [ghi]
Group 4 match (arg 4): [jkl]
Group 5 match (arg 5): [mno]
Group 6 match (arg 6): [pqr]
Group 7 match (arg 7): [stu]
Group 8 match (arg 8): [vwx]
Group 9 match (arg 9): [yz!]
---
| after
###
{ "xxx": true }
###
{ "foo": false }
###
{ "123": true }
###
.f.o.o.
###
.f.o.o.
-- End --
Omitting subject, pattern or replacement yields `null`.
-- Testcase --
{%
printf("%.J\n", [
replace(null, "u", "x"),
replace("nullnull", null, "x"),
replace("foo", "o", null)
]);
%}
-- End --
-- Expect stdout --
[
null,
null,
null
]
-- End --
Exceptions in the callback terminate the replacement process and are
propagated to the calling context.
-- Testcase --
{%
replace("foo", "o", function(m) { die() });
%}
-- End --
-- Expect stderr --
Died
In [anonymous function](), line 2, byte 40:
called from function replace ([C])
called from anonymous function ([stdin]:2:43)
` replace("foo", "o", function(m) { die() });`
Near here --------------------------------^
-- End --
|
