Name: JavaScript Regular Expressions: Line Anchors
Description: Line anchors let you match the beginning or end of a line, not just the beginning or end of the entire string.

Line anchors let you match the beginning or end of a line, not just the beginning or end of the entire string.

Line anchors let you match the beginning or end of a line, not just the beginning or end of the entire string. This lesson covers the caret (^) and dollar sign ($) as line anchors, and the critical difference between matching a string’s boundaries versus matching individual lines. You’ll learn about the multi-line flag (m) that makes ^ and $ match at each line break, and build a pattern that matches lines starting with one value and ending with another.

app.js

import output from "./output.js";
// When we want to capture the beginning
// or end of a line we can use something
// called a line anchor
let str = `12/1/30`;
let regex = /12/g;

str = `12/1/30 12-30-35`;
regex = /^12/g;

// we've used carets in the past
// inside of character classes where
// they represent the negation of
// whatever characters are inside of
// that character class. Outside of a
// character class a caret is used
// as a line beginning operator

str = `12/1/30
12-30-35`;
regex = /^12/g;

console.log(regex.exec(str));

str = `12/1/30
12-30-35`;
regex = /^12/gm;

str = `12/1/30
12-30-35
11/12/30
12-12-2030`;
regex = /^12/gm;

regex = /^12.+30/gm;
regex = /^12.+30$/gm;

output(str, regex);