正则表达式
Why
How
Match Object encoding
Emoji
s = s.replaceAll("\\p{So}+", "");Question
# editor envir: https://rubular.com | a ruby regular expression editor
# title: regex notes
# author: bGZoCg
b.t # b as begining, t as end
loadScript.*lua # string begining with loadScript to lua.
loadScript.*?lua # string begining with loadScript fitstly to lua.
loadScript\((.*?),(.*?)\) # double groups
loadScript($1,id,$2) # add id
# (TO_DATE.*)(\d+-[a-z]+-\d+', ')DD(-MM-YY')
# INSERT INTO EMPLOYEES VALUES( '100','Steven','King','SKING', '515.123.4567' , TO_DATE('17-JUN-87', 'DD-MM-YY'), 'AD_PRES', '24000',NULL, NULL,'90') -->
[^ ] # Character class. any character contained between the square brackets(blank space).
[^ ]* # string interval with blank space(include `\n`)
[^ ]*?@[^ ]*?\.[^ ]* # email
[\w.]+@\w+\.(com|net|edu) #email
\w vs [^ ]*: [^ ]* include `\n`, former not.
[\u4e00-\u9fa5] # Simplied Chinese
[^\x00-\xff] # Double Bytes
https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*) # url
https?:/{2}\w.+$'# url
\(?\d{3}[-.)]\d{3}[-.]\d{4} # phone number[*]+# https://stackoverflow.com/questions/42058748/what-does-mean-in-regex
^(^?)*\?(.*)$ # https://stackoverflow.com/questions/15205994/what-does-mean-in-this-regex
\[(?:[^][]|(?R))*\] # https://stackoverflow.com/questions/17845014/what-does-the-regex-mean向前非贪婪匹配匹配: 全模拟也可以解决
[Rubular: a Ruby regular expression editor](https://rubular.com/)
[Regex Util download | SourceForge.net](https://sourceforge.net/projects/regex-util/)
[PowerGREP: Windows grep Software to Search (and Replace) through Files and Folders on Your PC and Network](https://www.powergrep.com/)
# Solution
1. while mo ni
2. ([0-9A-z-]*)/([0-9A-z-]*) \)$
3. TODO 从后贪婪匹配Navigation
- Rubular: a Ruby regular expression editor
- Regex Tester - Javascript, PCRE, PHP
- Regular Expression Tester
- Regular expression tool - regex.larsolavtorvik.com
- Nregex v/0.1
- jflap
- Regular Expressions Quick Start
- Regexper
- RegexBuddy: Learn, Create, Understand, Test, Use and Save Regular Expression
- Expresso Regular Expression Tool
- PowerGREP: Windows grep Software to Search (and Replace) through Files and Folders on Your PC and Network
- Regular-Expressions.info - Regex Tutorial, Examples and Reference - Regexp Patterns
- Regular Expression Library
- Regex Util download | SourceForge.net