Javascript正则表达式：是否可以在带有前缀和后缀的字符串中检索字符串？

Question

I wanted to know if it was possible via regex to find a text within a string along with let's say 2 prefix chars and 2 suffix chars to the found string. For example if we have this:

let longText = 'yo this is a foobar string man';
let textToFind = 'foobar';
// the result should be 'a foobar s'

Thanks!

Answer 1

Simply construct the regexp using the RegExp constructor and using String#match to get the desired match:

 let longText = 'yo this is a foobar string man'; let textToFind = 'foobar'; let regex = new RegExp(`. ${textToFind} .`); console.log(longText.match(regex)[0]); 

Answer 2

First the regex:

 console.log('yo this is a foobar string man'.match('.{2}foobar.{2}')); 

Secondly, this is basic stuff ... i would recommend you to read some tutorials of basic regex syntax, and start experimenting. There are some nice online tools to help you along the way:

https://www.regextester.com

https://www.debuggex.com

Also, besides the fact that nobody can read and understand its own regexes the next day, its a tool worth learning ;)