RegExp

flavor
- PCRE - Perl Compatible Regular Expressions
  - PostgreSQL
- PCRE2 - 2017
  - PHP >= 7.3
  - jit, stack memory -> heap memory mgmt
- re2
  - google/re2/wiki/Syntax
- js
  - mdn Regular expressions
- java
- .net
- python
tools
- https://regex101.com/
- https://www.regexpal.com/
- https://regexr.com/
- https://www.debuggex.com/
- https://regexbuddy.com/
  - Windows 应用
- https://extendsclass.com/regex-tester.html
  - Visualizer
参考
- RegexNote
- wikipedia Regular expression
- https://www.regular-expressions.info/
- Tempered Greedy Token https://stackoverflow.com/a/37343088/1870054
- https://benhoyt.com/writings/rob-pike-regex/ Rob Pike’s simple C regex matcher in Go
  - HN

// https://www.noulakaz.net/2007/03/18/a-regular-expression-to-check-for-prime-numbers/
// https://news.ycombinator.com/item?id=30564287
const isPrime = (n) => !/^1?$|^(11+?)\1+$/.test('1'.repeat(n));

// https://stackoverflow.com/a/201378/1870054
const emailFull =
  /(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9]))\.){3}(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9])|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])/;
const emailSimple = /^[^\s@]+@([^\s@.,]+\.)+[^\s@.,]{2,}$/;
// http://www.w3.org/TR/html5/forms.html#valid-e-mail-address
const emailW3c =
  /^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;

// 反匹配 - 除了给的不匹配其他都匹配
const notThis = /^(?:(?!this).)*$/;
// py, java ^(.(?!(some text)))*$
// pcre ^(?:(?!abc|xyz).)*$

type	regex	e.g.
phone-number	`^[+][(]{0,1}[0-9]{1,4}[)]{0,1}[-\s\./0-9]$`	`+(123) - 456-78-90`

escaped string - 匹配 'I\'am'
- (["'])((?:(?=(?:\\)*)\\.|.)*?)\1
- https://regex101.com/r/mS1zJ8

JavaScript

replacement - 替换
- $$ -> $
- $&
- `$``
- $'
- $<n>
- replacer(match,p1,p2,offset,wholeString,namedGroups)

RegExp

JavaScript​

JavaScript