js about regular expression application examples

This article mainly shares with you JS regular expression application examples, hoping to help everyone. Tool regexper/.com regular tool (may be a bit slow in China), we can try to install the source code on github.

2006/02/03
test/07/sd
2016/05/10
1997-03-07
1992-02 -45
2018-45-05
123456/23/458
1234/23/4795

//用中括号表示或者//用花括号表示次数{4} {4，} 大于4次 {4，8} 4到8次
\d{4}[/-]\d{2}[/-]\d{2}

g represents the global meaning

var reg = /\bis\b/g;
'He is a body.This is a dog.Where is she?'.replace(reg,'Is')
"He Is a body.This Is a dog.Where Is she?"

Constructor

RegExp()

Modifiers

g: Global match

i: Case-insensitive

m: What a good search

Metacharacters

1. The literal text character a abc matches a abc

2. Metacharacters are non-letter characters with special meanings in regular expressions * ^ $ {} [] () .

Character class

##Greedy Mode

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