[JavaScript] Append Text at the Beginning of Each Line

Paste your lines below:

Lines after prepended:

The first textarea is the lines to be prepended. The second textarea is the lines after prepended. The JavaScript code to append text at the beginning of each line is:

afterTextareaElm.value = oriTextareaElm.value.replace(/^/gm, inputElm.value);

^ means beginning of line.
g means global match
m means multiline matching

If you are not familiar with JavaScript regular expression, see [3].

References:

[1]	Search Links of Major Search Engines

[2]	[sed] Append Text at the Beginning of Each Line

[3]	Regular Expressions - JavaScript \| MDN JavaScript RegExp Object

[4]	css - HTML Textarea isn't responsive - Stack Overflow