Regex.findAll

Declaration and parameters

사용 조건

기본 포함 · 미정

Import std.regex in language mode 5.21.

The current compiler selects std/regex.tpz for this language mode. Availability in other released editions and inclusion in each installed distribution are Pending.

수신자

Regex

매개변수 제약

추가 계약은 미정입니다.

Regex.isMatch reports whether a match exists anywhere in the input. Regex.find returns Some containing the first match or None() when no match exists. Regex.findAll returns every nonoverlapping match in search order and returns an empty array when no match exists.

Search begins at the earliest Unicode scalar boundary that permits the complete pattern to match. At that position alternatives are tried in pattern order. Greedy repetitions prefer more scalars and lazy repetitions prefer fewer scalars while still allowing the rest of the pattern to match.

After a nonempty match, findAll resumes at its exclusive end. After an empty match, it resumes at the next Unicode scalar boundary. An empty match directly at the end of the preceding nonempty match is skipped and search advances to the next scalar boundary.

An empty pattern visits every scalar boundary, including both ends. The empty input has one boundary and produces one empty match for an empty pattern. Matching never splits the UTF-8 bytes of a scalar.

Regex.split and Regex.replaceAll use the same ordered match sequence as findAll. Repeated calls start a new search and do not retain a cursor. The input string and compiled pattern are unchanged.

The receiver is evaluated once before the positional arguments, which are evaluated once from left to right. Search does not invoke user callbacks or access external state. No match is an ordinary result and does not produce a diagnostic.

Match.start and Match.end are read-only nonnegative UTF-8 byte offsets in the original input. They follow the inclusive start and exclusive end of byte intervals. Both are scalar boundaries and the end does not exceed the UTF-8 byte length of the input.

Match.text is the matched substring. An empty match has equal start and end and an empty text value. The offsets are not string grapheme indexes. A match may select a combining mark inside a grapheme.

Encoding the original input with encodeUtf8, slicing its bytes from start to end, and calling decodeUtf8 returns Ok containing Match.text. This relationship also holds for non-ASCII input.

Match.groups returns an independent array indexed by capture number. Entry zero is Some containing the entire match. Capturing parentheses are numbered from one in opening-parenthesis order. Named groups participate in the same numbering and noncapturing groups do not.

A nonparticipating capture has value None(). A participating empty capture has value Some containing an empty string. A repeated capture retains the last participating capture in the selected match.

Match.named returns an independent map from capture names to captured strings. A nonparticipating named capture is absent. A participating empty named capture is present with an empty string. Names are inserted in ascending ASCII order.

Reading a Match field evaluates its receiver once and does not modify the Match or input. Mutating a groups array or named map does not affect a later field read. Field access cannot fail for a Match value.

결과

추가 계약은 미정입니다.

The declared result type is Array<Match>.

효과

미정

실패

미정

Result and effects

링크

Returns ordered nonoverlapping matches with scalar-boundary progress after empty matches.

Resolved contracts

링크

std.regex →

Search from the left and advance through nonoverlapping matches

링크

규칙topaz.stdlib.contract.regex-search.rule

Search from the left and advance through nonoverlapping matches

Regex.isMatch reports whether a match exists anywhere in the input. Regex.find returns Some containing the first match or None() when no match exists. Regex.findAll returns every nonoverlapping match in search order and returns an empty array when no match exists.

Search begins at the earliest Unicode scalar boundary that permits the complete pattern to match. At that position alternatives are tried in pattern order. Greedy repetitions prefer more scalars and lazy repetitions prefer fewer scalars while still allowing the rest of the pattern to match.

After a nonempty match, findAll resumes at its exclusive end. After an empty match, it resumes at the next Unicode scalar boundary. An empty match directly at the end of the preceding nonempty match is skipped and search advances to the next scalar boundary.

An empty pattern visits every scalar boundary, including both ends. The empty input has one boundary and produces one empty match for an empty pattern. Matching never splits the UTF-8 bytes of a scalar.

Regex.split and Regex.replaceAll use the same ordered match sequence as findAll. Repeated calls start a new search and do not retain a cursor. The input string and compiled pattern are unchanged.

The receiver is evaluated once before the positional arguments, which are evaluated once from left to right. Search does not invoke user callbacks or access external state. No match is an ordinary result and does not produce a diagnostic.

이유

One ordered match sequence makes searching, splitting, and replacement agree. Advancing after an empty match ensures progress without splitting a Unicode scalar. Boolean search is distinct from extracting Match data and does not introduce regex membership through the in operator.

예제 Choose the first successful alternative at the leftmost position →Choose a group alternative that allows the complete pattern to match →Return nonoverlapping matches in input order →Visit each boundary for an empty pattern and the empty input →Skip an empty match directly after a nonempty match →Return no match after scanning a longer valid input →

Choose the first successful alternative at the leftmost position

링크

run · running · 검증 · 미실행

main.tpzChoose the first successful alternative at the leftmost position플레이그라운드 열기 →

import std.regex { Regex }
import std.io
match (Regex.compile("a|ab")) {
case Ok(pattern) => {
match (pattern.find("zab")) {
case Some(found) => io.writeLine("{found.start}:{found.end}:{found.text}")
case None() => io.writeLine("no match")
}
let present = pattern.isMatch("zab")
let absent = pattern.isMatch("zzz")
io.writeLine("{present}:{absent}")
match (pattern.find("zzz")) {
case None() => io.writeLine("none")
case Some(_) => io.writeLine("present")
}
let matches = pattern.findAll("zzz")
io.writeLine("{matches.length}")
}
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

1:2:a
true:false
none
0

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

1:2:a
true:false
none
0

이 예제는 아직 실행하지 않았습니다.

Choose a group alternative that allows the complete pattern to match

링크

run · running · 검증 · 미실행

main.tpzChoose a group alternative that allows the complete pattern to match플레이그라운드 열기 →

import std.regex { Regex }
import std.io
match (Regex.compile("(a|ab)c")) {
case Ok(pattern) => {
match (pattern.find("abc")) {
case Some(found) => io.writeLine(found.text)
case None() => io.writeLine("no match")
}
}
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

abc

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

abc

이 예제는 아직 실행하지 않았습니다.

Return nonoverlapping matches in input order

링크

run · running · 검증 · 미실행

main.tpzReturn nonoverlapping matches in input order플레이그라운드 열기 →

import std.regex { Regex }
import std.io
match (Regex.compile("aa")) {
case Ok(pattern) => {
for found in (pattern.findAll("aaaaa")) {
io.writeLine("{found.start}:{found.end}:{found.text}")
}
}
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

0:2:aa
2:4:aa

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

0:2:aa
2:4:aa

이 예제는 아직 실행하지 않았습니다.

Visit each boundary for an empty pattern and the empty input

링크

run · running · 검증 · 미실행

main.tpzVisit each boundary for an empty pattern and the empty input플레이그라운드 열기 →

import std.regex { Regex }
import std.io
match (Regex.compile("")) {
case Ok(pattern) => {
for found in (pattern.findAll("ab")) {
io.writeLine("{found.start}:{found.end}")
}
io.writeLine("empty input")
for found in (pattern.findAll("")) {
io.writeLine("{found.start}:{found.end}")
}
}
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

0:0
1:1
2:2
empty input
0:0

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

0:0
1:1
2:2
empty input
0:0

이 예제는 아직 실행하지 않았습니다.

Skip an empty match directly after a nonempty match

링크

run · running · 검증 · 미실행

main.tpzSkip an empty match directly after a nonempty match플레이그라운드 열기 →

import std.regex { Regex }
import std.io
match (Regex.compile("a*")) {
case Ok(pattern) => {
for found in (pattern.findAll("ab")) {
io.writeLine("{found.start}:{found.end}:{found.text}")
}
}
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

0:1:a
2:2:

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

0:1:a
2:2:

이 예제는 아직 실행하지 않았습니다.

Return no match after scanning a longer valid input

링크

run · running · 검증 · 미실행

main.tpzReturn no match after scanning a longer valid input플레이그라운드 열기 →

import std.regex { Regex }
import std.io
let mut text = "a"
for step in (0 .. 17) {
text = text + text
}
match (Regex.compile("z")) {
case Ok(pattern) => io.writeLine("{pattern.isMatch(text)}")
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

false

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

false

이 예제는 아직 실행하지 않았습니다.

Read match boundaries and capture snapshots

링크

규칙topaz.stdlib.contract.regex-match.rule

Read match boundaries and capture snapshots

Match.start and Match.end are read-only nonnegative UTF-8 byte offsets in the original input. They follow the inclusive start and exclusive end of byte intervals. Both are scalar boundaries and the end does not exceed the UTF-8 byte length of the input.

Match.text is the matched substring. An empty match has equal start and end and an empty text value. The offsets are not string grapheme indexes. A match may select a combining mark inside a grapheme.

Encoding the original input with encodeUtf8, slicing its bytes from start to end, and calling decodeUtf8 returns Ok containing Match.text. This relationship also holds for non-ASCII input.

Match.groups returns an independent array indexed by capture number. Entry zero is Some containing the entire match. Capturing parentheses are numbered from one in opening-parenthesis order. Named groups participate in the same numbering and noncapturing groups do not.

A nonparticipating capture has value None(). A participating empty capture has value Some containing an empty string. A repeated capture retains the last participating capture in the selected match.

Match.named returns an independent map from capture names to captured strings. A nonparticipating named capture is absent. A participating empty named capture is present with an empty string. Names are inserted in ascending ASCII order.

Reading a Match field evaluates its receiver once and does not modify the Match or input. Mutating a groups array or named map does not affect a later field read. Field access cannot fail for a Match value.

이유

Byte offsets identify every exact match even when a pattern selects part of a grapheme. The byte-slice relationship makes those offsets usable without confusing them with text indexing. Optional numbered captures and omitted named entries distinguish absence from a captured empty string.

예제 Report UTF-8 byte offsets for non-ASCII matches →Recover a match through the byte slice identified by its offsets →Keep capture zero and distinguish missing and empty captures →Omit absent named captures and retain a captured empty string →

Report UTF-8 byte offsets for non-ASCII matches

링크

run · running · 검증 · 미실행

main.tpzReport UTF-8 byte offsets for non-ASCII matches플레이그라운드 열기 →

import std.regex { Regex }
import std.io
function show(patternText: string, text: string) -> () {
match (Regex.compile(patternText)) {
case Ok(pattern) => {
match (pattern.find(text)) {
case Some(found) => io.writeLine("{found.start}:{found.end}:{found.text}")
case None() => io.writeLine("no match")
}
}
case Err(_) => io.writeLine("compile failed")
}
}
show("한", "é한🙂")
show("́", "éx")

기대 출력종료 코드 0

2:5:한
1:3:́

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

2:5:한
1:3:́

이 예제는 아직 실행하지 않았습니다.

Recover a match through the byte slice identified by its offsets

링크

run · running · 검증 · 미실행

main.tpzRecover a match through the byte slice identified by its offsets플레이그라운드 열기 →

import std.regex { Regex }
import std.io
let text = "한x"
match (Regex.compile("한")) {
case Ok(pattern) => {
match (pattern.find(text)) {
case Some(found) => {
let bytes = text.encodeUtf8().slice(found.start, found.end)
match (bytes.decodeUtf8()) {
case Ok(decoded) => io.writeLine(decoded)
case Err(_) => io.writeLine("invalid UTF-8 slice")
}
}
case None() => io.writeLine("no match")
}
}
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

한

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

한

이 예제는 아직 실행하지 않았습니다.

Keep capture zero and distinguish missing and empty captures

링크

run · running · 검증 · 미실행

main.tpzKeep capture zero and distinguish missing and empty captures플레이그라운드 열기 →

import std.regex { Regex }
import std.io
match (Regex.compile("(?<word>a)(b)?()")) {
case Ok(pattern) => {
match (pattern.find("a")) {
case Some(found) => {
io.writeLine("{found.groups.length}")
for group in (found.groups) {
match (group) {
case Some(text) => io.writeLine("some={text}")
case None() => io.writeLine("none")
}
}
}
case None() => io.writeLine("no match")
}
}
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

4
some=a
some=a
none
some=

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

4
some=a
some=a
none
some=

이 예제는 아직 실행하지 않았습니다.

Omit absent named captures and retain a captured empty string

링크

run · running · 검증 · 미실행

main.tpzOmit absent named captures and retain a captured empty string플레이그라운드 열기 →

import std.regex { Regex }
import std.io
match (Regex.compile("(?<z>a)?(?<a>b*)")) {
case Ok(pattern) => {
match (pattern.find("")) {
case Some(found) => {
let mut snapshot = found.named
let hasOptional = snapshot.containsKey("z")
io.writeLine("{hasOptional}")
match (snapshot.get("a")) {
case Some(text) => io.writeLine("some={text}")
case None() => io.writeLine("none")
}
snapshot.insert("a", "changed")
match (found.named.get("a")) {
case Some(text) => io.writeLine("again={text}")
case None() => io.writeLine("none")
}
}
case None() => io.writeLine("no match")
}
}
case Err(_) => io.writeLine("compile failed")
}

기대 출력종료 코드 0

false
some=
again=

$ topaz run main.tpz · 대상 제품 5.21.3

기대 결과

실행을 마칩니다. 종료 코드 0.

표준 오류 출력 없음.

기대 표준 출력

false
some=
again=

이 예제는 아직 실행하지 않았습니다.

문서 검색

Regex.findAll

Declaration and parameters

사용 조건

수신자

매개변수 제약

결과

효과

실패

Result and effects

Resolved contracts

Search from the left and advance through nonoverlapping matches

Search from the left and advance through nonoverlapping matches

이유

Choose the first successful alternative at the leftmost position

기대 결과

Choose a group alternative that allows the complete pattern to match

기대 결과

Return nonoverlapping matches in input order

기대 결과

Visit each boundary for an empty pattern and the empty input

기대 결과

Skip an empty match directly after a nonempty match

기대 결과

Return no match after scanning a longer valid input

기대 결과

Read match boundaries and capture snapshots

Read match boundaries and capture snapshots

이유

Report UTF-8 byte offsets for non-ASCII matches

기대 결과

Recover a match through the byte slice identified by its offsets

기대 결과

Keep capture zero and distinguish missing and empty captures

기대 결과

Omit absent named captures and retain a captured empty string

기대 결과

메뉴

Declaration and parameters

사용 조건

수신자

매개변수 제약

결과

효과

실패

Result and effects

Resolved contracts

Related entries

Search from the left and advance through nonoverlapping matches

Search from the left and advance through nonoverlapping matches

이유

Choose the first successful alternative at the leftmost position

기대 결과

Choose a group alternative that allows the complete pattern to match

기대 결과

Return nonoverlapping matches in input order

기대 결과

Visit each boundary for an empty pattern and the empty input

기대 결과

Skip an empty match directly after a nonempty match

기대 결과

Return no match after scanning a longer valid input

기대 결과

Read match boundaries and capture snapshots

Read match boundaries and capture snapshots

이유

Report UTF-8 byte offsets for non-ASCII matches

기대 결과

Recover a match through the byte slice identified by its offsets

기대 결과

Keep capture zero and distinguish missing and empty captures

기대 결과

Omit absent named captures and retain a captured empty string

기대 결과