We’ve posted all kinds of various regular expression builders (RegExr, Rejex, and ReguLazy) to help verify that the regex you’re using will match the content it is running against. When you’re just learning regular expressions those tools might be a little confusing, and so we thought we should offer up a couple free sites that should help out beginners.
The strfriend site lets you input a regular expression that you’ve come up with and it will build a visual representation of how the expression will be processed. The screenshot you see above is from strfriend, and is a breakdown of how the regex will be executed against some text. The example in the screenshot is below, and can identify an email address:
Let us know if you’ve come across any helpful regex tools that you use on a regular basis.