37 Regex

Hard

For all regexes command reference this website

This is a string in which we will look for our pattern.

Initialize the regex. Let’s break it down:

\\S : matches any non-white space character
* : matches preceding subexpression 0 or more times.
@ : matches single character ’@’
[a-z] : matches any character that is a letter.
+ : matches preceding subexpression 1 or more times.

Initialize the matcher with the string and regex. Get the number of matches.

For each match, extract it from the string.

matcher.find() returns the first not-yet-extracted match. It is returned as an Option<MatchData>. We print the matched expression.

regex.cj

import std.regex.*

main() {
    var a: String = """
        My name is Postman Pat
        my email address is postman.pat@notarealemailaddress.com
        My cat's name is Jess, and her email is dont.contact@mycat.com
    """

    var regex = Regex("[\\S]*@[\\S]*\\.[a-z]+")

    var matcher = Matcher(regex, a)
    let number_of_matches = matcher.allCount()

    for (_ in 0..number_of_matches) {
        var help = matcher.find().getOrThrow().matchStr()
        println(help)
    }
}

// Output: 
// postman.pat@notarealemailaddress.com
// dont.contact@mycat.com