正则表达式备忘录
正则语法速查与常用模式参考，涵盖字符类、量词、锚点、断言等。 完全免费、免注册、浏览器本地处理，不上传服务器。
Character Classes
[abc]Any of a, b, or c/[aeiou]/.test('a') → true点击复制[^abc]Not a, b, nor c/[^aeiou]/.test('b') → true点击复制[a-z]Character range a to z/[a-z]/.test('m') → true点击复制.Any character except newline/./.test('x') → true点击复制\dDigit [0-9]/\d/.test('5') → true点击复制\DNon-digit [^0-9]/\D/.test('a') → true点击复制\wWord character [a-zA-Z0-9_]/\w/.test('_') → true点击复制\WNon-word character/\W/.test('!') → true点击复制\sWhitespace/\s/.test(' ') → true点击复制\SNon-whitespace/\S/.test('a') → true点击复制Quantifiers
*0 or more/go*/.test('g') → true点击复制+1 or more/go+/.test('go') → true点击复制?0 or 1 (optional)/colou?r/.test('color') → true点击复制{n}Exactly n/a{3}/.test('aaa') → true点击复制{n,}n or more/a{2,}/.test('aaa') → true点击复制{n,m}Between n and m/a{2,4}/.test('aaa') → true点击复制*?0 or more (lazy)/a*?/.exec('aaa') → ''点击复制+?1 or more (lazy)/a+?/.exec('aaa') → 'a'点击复制Anchors
^Start of string/^hello/.test('hello world') → true点击复制$End of string/world$/.test('hello world') → true点击复制\bWord boundary/\bword\b/.test('a word b') → true点击复制\BNon-word boundary/\Bord\B/.test('word') → false点击复制Groups & Capturing
(abc)Capture group/(ab)c/.exec('abc')[1] → 'ab'点击复制(?:abc)Non-capturing group/(?:ab)c/.exec('abc')[1] → undefined点击复制(?<name>abc)Named capture group/(?<w>ab)c/.exec('abc').groups.w → 'ab'点击复制\1Backreference to group 1/(a)\1/.test('aa') → true点击复制$1Replacement reference'ab'.replace(/(a)/, '$1x') → 'axb'点击复制Lookaround Assertions
(?=abc)Positive lookahead/a(?=b)/.test('ab') → true点击复制(?!abc)Negative lookahead/a(?!b)/.test('ac') → true点击复制(?<=abc)Positive lookbehind/(?<=a)b/.test('ab') → true点击复制(?<!abc)Negative lookbehind/(?<!a)b/.test('cb') → true点击复制Flags
gGlobal — find all matches'aaa'.replace(/a/g, 'b') → 'bbb'点击复制iCase-insensitive/a/i.test('A') → true点击复制mMultiline (^/$ match line ends)/^b/m.test('a\nb') → true点击复制sDotall (. matches newline)/a.b/s.test('a\nb') → true点击复制uUnicode/\u{1F600}/u.test('😀') → true点击复制ySticky (match at lastIndex)/a/y.exec('aaa') → 'a' at 0点击复制Common Patterns
^[\w.-]+@[\w.-]+\.\w+$Email (basic)/^[\w.-]+@[\w.-]+\.\w+$/.test('a@b.com') → true点击复制^https?://[\S]+$URL (basic)/^https?:\/\/[\S]+$/.test('http://x') → true点击复制^\d{4}-\d{2}-\d{2}$Date YYYY-MM-DD/^\d{4}-\d{2}-\d{2}$/.test('2024-01-01') → true点击复制^#?([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$Hex color/^#?([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/.test('#fff') → true点击复制^\d+$Integer only/^\d+$/.test('123') → true点击复制^-?\d+(\.\d+)?$Decimal number/^-?\d+(\.\d+)?$/.test('-3.14') → true点击复制^(?=.*[A-Z])(?=.*[a-z])(?=.*\d).{8,}$Strong password (8+ chars, upper, lower, digit)test('Abc12345') → true点击复制