I wrote JavaScript code that uses regular expressions to extract strings after a specific string, so I’d like to introduce it.

Using Regexper, a site that visualizes regular expressions,

/Email address: (.+?)(\\r\
|\\r|\
)/

When this regular expression is visualized, it looks like this:

• /Email address: (.+?)(\\r\ |\\r|\ )/ | Regexper

Below is JavaScript sample code for a regular expression that extracts strings after a specific string.

var text = [
  'Full name: Satoshi Nakamoto', 
  'Email address: satoshi_nakamoto@example.com',
  'Coutry: Japan',
].join('\
');

var regExp = /Email address: (.+?)(\\r\
|\\r|\
)/;
var results = text.match(regExp);
// [ 'Email address: satoshi_nakamoto@example.com\
',
//  'satoshi_nakamoto@example.com',
//  '\
',
//  index: 28,
//  input: 'Full name: Satoshi Nakamoto\
Email address: satoshi_nakamoto@example.com\
Coutry: Japan' ]

var email = (results && results[1]) ? results[1] : '';
// 'satoshi_nakamoto@example.com'

Personally, I’m not good with regular expressions, so I save these practical patterns as articles and search this site to use them when needed.

That’s all from the Gemba.