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# match builtin
[match("( )*"; "g")]
"abc"
[{"offset":0,"length":0,"string":"","captures":[{"offset":-1,"string":null,"length":0,"name":null}]},{"offset":1,"length":0,"string":"","captures":[{"offset":-1,"string":null,"length":0,"name":null}]},{"offset":2,"length":0,"string":"","captures":[{"offset":-1,"string":null,"length":0,"name":null}]},{"offset":3,"length":0,"string":"","captures":[{"offset":-1,"string":null,"length":0,"name":null}]}]
[match("( )*"; "gn")]
"abc"
[]
[match(""; "g")]
"ab"
[{"offset":0,"length":0,"string":"","captures":[]},{"offset":1,"length":0,"string":"","captures":[]},{"offset":2,"length":0,"string":"","captures":[]}]
[match("a"; "gi")]
"āáàä"
[]
[match(["(bar)"])]
"foo bar"
[{"offset": 4, "length": 3, "string": "bar", "captures":[{"offset": 4, "length": 3, "string": "bar", "name": null}]}]
# offsets account for combining codepoints and multi-byte UTF-8
[match("bar")]
"ā bar with a combining codepoint U+0304"
[{"offset": 3, "length": 3, "string": "bar", "captures":[]}]
# matches with combining codepoints still count them in their length
[match("bār")]
"a bār"
[{"offset": 2, "length": 4, "string": "bār", "captures":[]}]
[match(".+?\\b")]
"ā two-codepoint grapheme"
[{"offset": 0, "length": 2, "string": "ā", "captures":[]}]
[match(["foo (?<bar123>bar)? foo", "ig"])]
"foo bar foo foo foo"
[{"offset": 0, "length": 11, "string": "foo bar foo", "captures":[{"offset": 4, "length": 3, "string": "bar", "name": "bar123"}]},{"offset":12, "length": 8, "string": "foo foo", "captures":[{"offset": -1, "length": 0, "string": null, "name": "bar123"}]}]
# non-matched optional group
"a","b","c" | capture("(?<x>a)?b?")
null
{"x":"a"}
{"x":null}
{"x":null}
"a","b","c" | match("(?<x>a)?b?")
null
{"offset":0,"length":1,"string":"a","captures":[{"offset":0,"length":1,"string":"a","name":"x"}]}
{"offset":0,"length":1,"string":"b","captures":[{"offset":-1,"string":null,"length":0,"name":"x"}]}
{"offset":0,"length":0,"string":"","captures":[{"offset":-1,"string":null,"length":0,"name":"x"}]}
# same as above but allow empty match for group
"a","b","c" | capture("(?<x>a?)?b?")
null
{"x":"a"}
{"x":""}
{"x":""}
"a","b","c" | match("(?<x>a?)?b?")
null
{"offset":0,"length":1,"string":"a","captures":[{"offset":0,"length":1,"string":"a","name":"x"}]}
{"offset":0,"length":1,"string":"b","captures":[{"offset":0,"string":"","length":0,"name":"x"}]}
{"offset":0,"length":0,"string":"","captures":[{"offset":0,"string":"","length":0,"name":"x"}]}
#test builtin
[test("( )*"; "gn")]
"abc"
[false]
[test("ā")]
"ā"
[true]
capture("(?<a>[a-z]+)-(?<n>[0-9]+)")
"xyzzy-14"
{"a":"xyzzy","n":"14"}
# jq-coded utilities built on match:
#
# The second element in these tests' inputs tests the case where the
# fromstring matches both the head and tail of the string
[.[] | sub(", "; ":")]
["a,b, c, d, e,f", ", a,b, c, d, e,f, "]
["a,b:c, d, e,f",":a,b, c, d, e,f, "]
sub("^(?<head>.)"; "Head=\(.head) Tail=")
"abcdef"
"Head=a Tail=bcdef"
[.[] | gsub(", "; ":")]
["a,b, c, d, e,f",", a,b, c, d, e,f, "]
["a,b:c:d:e,f",":a,b:c:d:e,f:"]
gsub("(?<d>\\d)"; ":\(.d);")
"a1b2"
"a:1;b:2;"
gsub("a";"b")
"aaaaa"
"bbbbb"
gsub("(.*)"; ""; "x")
""
""
gsub(""; "a"; "g")
""
"a"
gsub("^"; ""; "g")
"a"
"a"
gsub(""; "a"; "g")
"a"
"aaa"
gsub("$"; "a"; "g")
"a"
"aa"
gsub("^"; "a")
""
"a"
gsub("(?=u)"; "u")
"qux"
"quux"
gsub("^.*a"; "b")
"aaa"
"b"
gsub("^.*?a"; "b")
"aaa"
"baa"
# The following is for regression testing and should not be construed as a requirement:
[gsub("a"; "b", "c")]
"a"
["b","c"]
[.[] | scan(", ")]
["a,b, c, d, e,f",", a,b, c, d, e,f, "]
[", ",", ",", ",", ",", ",", ",", ",", "]
[.[]|[[sub(", *";":")], [gsub(", *";":")], [scan(", *")]]]
["a,b, c, d, e,f",", a,b, c, d, e,f, "]
[[["a:b, c, d, e,f"],["a:b:c:d:e:f"],[",",", ",", ",", ",","]],[[":a,b, c, d, e,f, "],[":a:b:c:d:e:f:"],[", ",",",", ",", ",", ",",",", "]]]
[.[]|[[sub(", +";":")], [gsub(", +";":")], [scan(", +")]]]
["a,b, c, d, e,f",", a,b, c, d, e,f, "]
[[["a,b:c, d, e,f"],["a,b:c:d:e,f"],[", ",", ",", "]],[[":a,b, c, d, e,f, "],[":a,b:c:d:e,f:"],[", ",", ",", ",", ",", "]]]
[.[] | scan("b+"; "i")]
["","bBb","abcABBBCabbbc"]
["bBb","b","BBB","bbb"]
# reference to named captures
gsub("(?<x>.)[^a]*"; "+\(.x)-")
"Abcabc"
"+A-+a-"
gsub("(?<x>.)(?<y>[0-9])"; "\(.x|ascii_downcase)\(.y)")
"A1 B2 CD"
"a1 b2 CD"
gsub("\\b(?<x>.)"; "\(.x|ascii_downcase)")
"ABC DEF"
"aBC dEF"
gsub("[^a-z]*(?<x>[a-z]*)"; "Z\(.x)")
"123foo456bar"
"ZfooZbarZ"
# utf-8
sub("(?<x>.)"; "\(.x)!")
"’"
"’!"
[sub("a"; "b", "c")]
"a"
["b","c"]
[sub("(?<a>.)"; "\(.a|ascii_upcase)", "\(.a|ascii_downcase)", "c")]
"aB"
["AB","aB","cB"]
[gsub("(?<a>.)"; "\(.a|ascii_upcase)", "\(.a|ascii_downcase)", "c")]
"aB"
["AB","ab","cc"]
# splits
[splits("")]
"ab"
["","a","b",""]
[splits("c")]
"ab"
["ab"]
[splits("a+"; "i")]
"abAABBabA"
["","b","BB","b",""]
[splits("b+"; "i")]
"abAABBabA"
["a","AA","a","A"]
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