Regex Lembar Referensi

Q: Apa itu ekspresi reguler (regex)?

Ekspresi reguler adalah urutan karakter yang mendefinisikan pola pencarian. Digunakan untuk pencarian string, pencocokan, dan manipulasi. Regex didukung secara native di JavaScript, Python, Java, PHP, Go, dan sebagian besar bahasa pemrograman modern.

Q: Apa perbedaan antara kuantifier rakus dan malas?

Kuantifier rakus (*, +, {n,m}) cocok dengan sebanyak mungkin karakter. Kuantifier malas (*?, +?, {n,m}?) cocok dengan sesedikit mungkin karakter.

Q: Apa itu lookahead dan lookbehind?

Lookahead (?=...) dan lookbehind (?<=...) adalah pernyataan lebar nol — mereka memeriksa pola tanpa mengonsumsi karakter. Lookahead positif (?=foo) menegaskan bahwa 'foo' mengikuti. Lookahead negatif (?!foo) menegaskan bahwa 'foo' TIDAK mengikuti.

Q: Apakah pola regex sama di semua bahasa?

Sintaks inti (kelas karakter, kuantifier, jangkar) konsisten di sebagian besar bahasa. Namun, fitur seperti lookbehind, grup bernama, dan flag spesifik bervariasi menurut mesin.

Referensi ekspresi reguler lengkap dengan sintaks, flag, grup, lookahead, dan contoh pola dunia nyata.

Coba di Tester Regex →

Kelas Karakter

Sintaks	Deskripsi	Contoh	Cocok
`.`	Any character except newline	`h.t`	hat, hit, hot
`\d`	Digit [0-9]	`\d+`	123, 42, 7
`\D`	Non-digit [^0-9]	`\D+`	abc, foo, !
`\w`	Word char [a-zA-Z0-9_]	`\w+`	hello, foo_bar
`\W`	Non-word character	`\W+`	!@#, spaces
`\s`	Whitespace (space, tab, newline)	`a\sb`	'a b', 'a\tb'
`\S`	Non-whitespace	`\S+`	hello, 123
`[abc]`	One of a, b, or c	`[aeiou]`	'a', 'e', 'i'
`[^abc]`	Not a, b, or c	`[^aeiou]`	'b', 'c', '1'
`[a-z]`	Character in range a–z	`[a-f]`	'a', 'b', 'f'
`[a-zA-Z]`	Letter (any case)	`[a-zA-Z]+`	hello, World
`\p{L}`	Any Unicode letter (u flag)	`\p{L}+`	café, 你好

Jangkar & Batas

Sintaks	Deskripsi	Contoh	Cocok
`^`	Start of string (or line with m flag)	`^Hello`	Hello world
`$`	End of string (or line with m flag)	`world$`	Hello world
`\b`	Word boundary	`\bcat\b`	'cat' but not 'catfish'
`\B`	Non-word boundary	`\Bcat`	'catfish' (not standalone 'cat')
`\A`	Start of string (Python/Java)	`\AHello`	Hello world
`\Z`	End of string (Python/Java)	`world\Z`	Hello world

Kuantifier

Sintaks	Deskripsi	Contoh	Cocok
`*`	0 or more (greedy)	`a*`	'', 'a', 'aaa'
`+`	1 or more (greedy)	`a+`	'a', 'aaa'
`?`	0 or 1 (optional)	`colou?r`	color, colour
`{n}`	Exactly n times	`\d{4}`	'2024', '1999'
`{n,}`	n or more times	`\d{2,}`	'12', '1234'
`{n,m}`	Between n and m times	`\d{2,4}`	'12', '123', '1234'
`*?`	0 or more (lazy)	`<.*?>`	'<b>' from '<b>text</b>'
`+?`	1 or more (lazy)	`<.+?>`	'<b>' from '<b>text</b>'
`??`	0 or 1 (lazy)	`a??b`	'b' or 'ab'

Grup & Referensi

Sintaks	Deskripsi	Contoh	Cocok
`(abc)`	Capturing group	`(\d+)-(\d+)`	Captures both numbers in '2024-01'
`(?:abc)`	Non-capturing group	`(?:foo\|bar)baz`	'foobaz', 'barbaz'
`(?<name>abc)`	Named capturing group	`(?<year>\d{4})`	Named capture of year
`\1`	Backreference to group 1	`(\w+)\s\1`	'the the', 'word word'
`\k<name>`	Named backreference	`(?<tag>\w+).*\k<tag>`	Matching HTML tags
`(?\|...)`	Branch reset group (PCRE)	`(?\|(a)\|(b))`	Both captured in group 1

Lookahead & Lookbehind

Sintaks	Deskripsi	Contoh	Cocok
`(?=abc)`	Positive lookahead — must be followed by abc	`\d+(?= dollars)`	'100' in '100 dollars'
`(?!abc)`	Negative lookahead — must NOT be followed by abc	`\d+(?! dollars)`	'100' in '100 euros'
`(?<=abc)`	Positive lookbehind — must be preceded by abc	`(?<=\$)\d+`	'100' in '$100'
`(?<!abc)`	Negative lookbehind — must NOT be preceded by abc	`(?<!\$)\d+`	'100' in '100 items' but not '$100'

Flag (Modifier)

Flag	Nama	Deskripsi
`g`	Global	Find all matches, not just the first
`i`	Case-insensitive	Match regardless of case (A = a)
`m`	Multiline	^ and $ match start/end of each line
`s`	Dotall	. matches newline characters too
`u`	Unicode	Enable full Unicode support (\p{} classes)
`y`	Sticky	Match only at lastIndex position (JS)
`x`	Extended	Allow whitespace + comments in pattern (Python/PHP)

Pola Umum

Pola	Regex	Uji
Email	`[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}`	Coba di Tester Regex →
URL	`https?:\/\/[\w\-]+(\.[\w\-]+)+[\w\-._~:/?#[\]@!$&'()+,;=%]`	Coba di Tester Regex →
IPv4 Address	`\b(?:(?:25[0-5]\|2[0-4]\d\|[01]?\d\d?)\.){3}(?:25[0-5]\|2[0-4]\d\|[01]?\d\d?)\b`	Coba di Tester Regex →
Phone (US)	`\+?1?[\s.-]?$?\d{3}$?[\s.-]?\d{3}[\s.-]?\d{4}`	Coba di Tester Regex →
Date (YYYY-MM-DD)	`\d{4}-(?:0[1-9]\|1[0-2])-(?:0[1-9]\|[12]\d\|3[01])`	Coba di Tester Regex →
Time (HH:MM)	`(?:[01]\d\|2[0-3]):[0-5]\d`	Coba di Tester Regex →
UUID	`[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}`	Coba di Tester Regex →
Hex Color	`#(?:[0-9a-fA-F]{3}){1,2}\b`	Coba di Tester Regex →
Slug	`[a-z0-9]+(?:-[a-z0-9]+)*`	Coba di Tester Regex →
ZIP Code (US)	`\d{5}(?:-\d{4})?`	Coba di Tester Regex →
Credit Card	`(?:4[0-9]{12}(?:[0-9]{3})?\|5[1-5][0-9]{14}\|3[47][0-9]{13})`	Coba di Tester Regex →
HTML Tag	`<([a-zA-Z][a-zA-Z0-9])(?:\s[^>])?\/?>.*?<\/\1>`	Coba di Tester Regex →
Markdown Bold	`\\([^]+)\\*`	Coba di Tester Regex →
JWT Token	`[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+`	Coba di Tester Regex →
Semver	`\bv?(?:0\|[1-9]\d)\.(?:0\|[1-9]\d)\.(?:0\|[1-9]\d*)(?:-[\w.]+)?\b`	Coba di Tester Regex →
GitHub Username	`(?<=github\.com\/)([a-zA-Z0-9](?:[a-zA-Z0-9-]{0,37}[a-zA-Z0-9])?)`	Coba di Tester Regex →
Positive Integer	`^[1-9]\d*$`	Coba di Tester Regex →
Float / Decimal	`-?\d+(?:\.\d+)?`	Coba di Tester Regex →
Blank Lines	`^\s*$`	Coba di Tester Regex →
Duplicate Words	`\b(\w+)\s+\1\b`	Coba di Tester Regex →

Pertanyaan yang Sering Diajukan

Apa itu ekspresi reguler (regex)?

Ekspresi reguler adalah urutan karakter yang mendefinisikan pola pencarian. Digunakan untuk pencarian string, pencocokan, dan manipulasi. Regex didukung secara native di JavaScript, Python, Java, PHP, Go, dan sebagian besar bahasa pemrograman modern.

Apa perbedaan antara kuantifier rakus dan malas?

Kuantifier rakus (*, +, {n,m}) cocok dengan sebanyak mungkin karakter. Kuantifier malas (*?, +?, {n,m}?) cocok dengan sesedikit mungkin karakter.

Apa itu lookahead dan lookbehind?

Lookahead (?=...) dan lookbehind (?<=...) adalah pernyataan lebar nol — mereka memeriksa pola tanpa mengonsumsi karakter. Lookahead positif (?=foo) menegaskan bahwa 'foo' mengikuti. Lookahead negatif (?!foo) menegaskan bahwa 'foo' TIDAK mengikuti.

Apakah pola regex sama di semua bahasa?

Sintaks inti (kelas karakter, kuantifier, jangkar) konsisten di sebagian besar bahasa. Namun, fitur seperti lookbehind, grup bernama, dan flag spesifik bervariasi menurut mesin.

Regex Lembar Referensi

Referensi ekspresi reguler lengkap dengan sintaks, flag, grup, lookahead, dan contoh pola dunia nyata.

Coba di Tester Regex →

Kelas Karakter

Sintaks	Deskripsi	Contoh	Cocok
`.`	Any character except newline	`h.t`	hat, hit, hot
`\d`	Digit [0-9]	`\d+`	123, 42, 7
`\D`	Non-digit [^0-9]	`\D+`	abc, foo, !
`\w`	Word char [a-zA-Z0-9_]	`\w+`	hello, foo_bar
`\W`	Non-word character	`\W+`	!@#, spaces
`\s`	Whitespace (space, tab, newline)	`a\sb`	'a b', 'a\tb'
`\S`	Non-whitespace	`\S+`	hello, 123
`[abc]`	One of a, b, or c	`[aeiou]`	'a', 'e', 'i'
`[^abc]`	Not a, b, or c	`[^aeiou]`	'b', 'c', '1'
`[a-z]`	Character in range a–z	`[a-f]`	'a', 'b', 'f'
`[a-zA-Z]`	Letter (any case)	`[a-zA-Z]+`	hello, World
`\p{L}`	Any Unicode letter (u flag)	`\p{L}+`	café, 你好

Jangkar & Batas

Sintaks	Deskripsi	Contoh	Cocok
`^`	Start of string (or line with m flag)	`^Hello`	Hello world
`$`	End of string (or line with m flag)	`world$`	Hello world
`\b`	Word boundary	`\bcat\b`	'cat' but not 'catfish'
`\B`	Non-word boundary	`\Bcat`	'catfish' (not standalone 'cat')
`\A`	Start of string (Python/Java)	`\AHello`	Hello world
`\Z`	End of string (Python/Java)	`world\Z`	Hello world

Kuantifier

Sintaks	Deskripsi	Contoh	Cocok
`*`	0 or more (greedy)	`a*`	'', 'a', 'aaa'
`+`	1 or more (greedy)	`a+`	'a', 'aaa'
`?`	0 or 1 (optional)	`colou?r`	color, colour
`{n}`	Exactly n times	`\d{4}`	'2024', '1999'
`{n,}`	n or more times	`\d{2,}`	'12', '1234'
`{n,m}`	Between n and m times	`\d{2,4}`	'12', '123', '1234'
`*?`	0 or more (lazy)	`<.*?>`	'<b>' from '<b>text</b>'
`+?`	1 or more (lazy)	`<.+?>`	'<b>' from '<b>text</b>'
`??`	0 or 1 (lazy)	`a??b`	'b' or 'ab'

Grup & Referensi

Sintaks	Deskripsi	Contoh	Cocok
`(abc)`	Capturing group	`(\d+)-(\d+)`	Captures both numbers in '2024-01'
`(?:abc)`	Non-capturing group	`(?:foo\|bar)baz`	'foobaz', 'barbaz'
`(?<name>abc)`	Named capturing group	`(?<year>\d{4})`	Named capture of year
`\1`	Backreference to group 1	`(\w+)\s\1`	'the the', 'word word'
`\k<name>`	Named backreference	`(?<tag>\w+).*\k<tag>`	Matching HTML tags
`(?\|...)`	Branch reset group (PCRE)	`(?\|(a)\|(b))`	Both captured in group 1

Lookahead & Lookbehind

Sintaks	Deskripsi	Contoh	Cocok
`(?=abc)`	Positive lookahead — must be followed by abc	`\d+(?= dollars)`	'100' in '100 dollars'
`(?!abc)`	Negative lookahead — must NOT be followed by abc	`\d+(?! dollars)`	'100' in '100 euros'
`(?<=abc)`	Positive lookbehind — must be preceded by abc	`(?<=\$)\d+`	'100' in '$100'
`(?<!abc)`	Negative lookbehind — must NOT be preceded by abc	`(?<!\$)\d+`	'100' in '100 items' but not '$100'

Flag (Modifier)

Flag	Nama	Deskripsi
`g`	Global	Find all matches, not just the first
`i`	Case-insensitive	Match regardless of case (A = a)
`m`	Multiline	^ and $ match start/end of each line
`s`	Dotall	. matches newline characters too
`u`	Unicode	Enable full Unicode support (\p{} classes)
`y`	Sticky	Match only at lastIndex position (JS)
`x`	Extended	Allow whitespace + comments in pattern (Python/PHP)

Pola Umum

Pola	Regex	Uji
Email	`[a-zA-Z0-9._%+\-]+@[a-zA-Z0-9.\-]+\.[a-zA-Z]{2,}`	Coba di Tester Regex →
URL	`https?:\/\/[\w\-]+(\.[\w\-]+)+[\w\-._~:/?#[\]@!$&'()+,;=%]`	Coba di Tester Regex →
IPv4 Address	`\b(?:(?:25[0-5]\|2[0-4]\d\|[01]?\d\d?)\.){3}(?:25[0-5]\|2[0-4]\d\|[01]?\d\d?)\b`	Coba di Tester Regex →
Phone (US)	`\+?1?[\s.-]?$?\d{3}$?[\s.-]?\d{3}[\s.-]?\d{4}`	Coba di Tester Regex →
Date (YYYY-MM-DD)	`\d{4}-(?:0[1-9]\|1[0-2])-(?:0[1-9]\|[12]\d\|3[01])`	Coba di Tester Regex →
Time (HH:MM)	`(?:[01]\d\|2[0-3]):[0-5]\d`	Coba di Tester Regex →
UUID	`[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}`	Coba di Tester Regex →
Hex Color	`#(?:[0-9a-fA-F]{3}){1,2}\b`	Coba di Tester Regex →
Slug	`[a-z0-9]+(?:-[a-z0-9]+)*`	Coba di Tester Regex →
ZIP Code (US)	`\d{5}(?:-\d{4})?`	Coba di Tester Regex →
Credit Card	`(?:4[0-9]{12}(?:[0-9]{3})?\|5[1-5][0-9]{14}\|3[47][0-9]{13})`	Coba di Tester Regex →
HTML Tag	`<([a-zA-Z][a-zA-Z0-9])(?:\s[^>])?\/?>.*?<\/\1>`	Coba di Tester Regex →
Markdown Bold	`\\([^]+)\\*`	Coba di Tester Regex →
JWT Token	`[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+\.[A-Za-z0-9-_]+`	Coba di Tester Regex →
Semver	`\bv?(?:0\|[1-9]\d)\.(?:0\|[1-9]\d)\.(?:0\|[1-9]\d*)(?:-[\w.]+)?\b`	Coba di Tester Regex →
GitHub Username	`(?<=github\.com\/)([a-zA-Z0-9](?:[a-zA-Z0-9-]{0,37}[a-zA-Z0-9])?)`	Coba di Tester Regex →
Positive Integer	`^[1-9]\d*$`	Coba di Tester Regex →
Float / Decimal	`-?\d+(?:\.\d+)?`	Coba di Tester Regex →
Blank Lines	`^\s*$`	Coba di Tester Regex →
Duplicate Words	`\b(\w+)\s+\1\b`	Coba di Tester Regex →

Pertanyaan yang Sering Diajukan

Apa itu ekspresi reguler (regex)?

Apa perbedaan antara kuantifier rakus dan malas?

Kuantifier rakus (*, +, {n,m}) cocok dengan sebanyak mungkin karakter. Kuantifier malas (*?, +?, {n,m}?) cocok dengan sesedikit mungkin karakter.

Apa itu lookahead dan lookbehind?

Apakah pola regex sama di semua bahasa?

Sintaks inti (kelas karakter, kuantifier, jangkar) konsisten di sebagian besar bahasa. Namun, fitur seperti lookbehind, grup bernama, dan flag spesifik bervariasi menurut mesin.

Regex Lembar Referensi

Kelas Karakter

Jangkar & Batas

Kuantifier

Grup & Referensi

Lookahead & Lookbehind

Flag (Modifier)

Pola Umum

Pertanyaan yang Sering Diajukan

Apa itu ekspresi reguler (regex)?

Apa perbedaan antara kuantifier rakus dan malas?

Apa itu lookahead dan lookbehind?

Apakah pola regex sama di semua bahasa?

References & cheat sheets

Regex Lembar Referensi

Kelas Karakter

Jangkar & Batas

Kuantifier

Grup & Referensi

Lookahead & Lookbehind

Flag (Modifier)

Pola Umum

Pertanyaan yang Sering Diajukan

Apa itu ekspresi reguler (regex)?

Apa perbedaan antara kuantifier rakus dan malas?

Apa itu lookahead dan lookbehind?

Apakah pola regex sama di semua bahasa?