{"id":48151,"date":"2020-03-02T03:01:48","date_gmt":"2020-03-01T17:01:48","guid":{"rendered":"http:\/\/www.rjmprogramming.com.au\/ITblog\/?p=48151"},"modified":"2020-02-29T10:11:37","modified_gmt":"2020-02-29T00:11:37","slug":"javascript-replace-regexp-multiline-primer-tutorial","status":"publish","type":"post","link":"https:\/\/www.rjmprogramming.com.au\/ITblog\/javascript-replace-regexp-multiline-primer-tutorial\/","title":{"rendered":"Javascript Replace RegExp Multiline Primer Tutorial"},"content":{"rendered":"
\"Javascript<\/a>

Javascript Replace RegExp Multiline Primer Tutorial<\/p><\/div>\n

Lately we have had a couple of web application projects using HTML textarea<\/a> elements extensively. When you involve this particular HTML element type ascii code 10 (line feed) comes into play, and we, as programmers, may need to contend with …<\/p>\n


\nmultiline data
\n<\/code><\/p>\n

… in this scenario. It’s easy enough to use Javascript replace<\/a> function combined with regular expressions<\/a> (RegExp) to simulate for a variable<\/font> x what x.trim<\/a>() does for a single line of string data (with no ascii code 10 nor 13), as per …<\/p>\n


\nvar outstr = x.replace(\/^\\s+|\\s+$\/g,'');
\n<\/code><\/p>\n

… but I’d never used, nor thought to use, the Javascript replace function combined with regular expressions to trim a whole paragraph of string data, as you might find resulting from the use of an HTML textarea element. We’d like to thank this great link<\/a>, for the heads up, in this regard, used in this Javascript function (suitable for multiline string data)<\/font> …<\/p>\n


\n function myTrim(x) {
\n return x.replace(\/^\\s+|\\s+$\/gm<\/font>,'');
\n }
\n<\/code><\/p>\n

… used in today’s HTML and Javascript javascript_regex_multiline.html<\/a>‘s proof of concept web application<\/a> below can show you this in action …<\/p>\n