Regular Expressions 101

Grab all placeholder "tags" that are alphanumeric with optional underscores. In this example my placeholders are double curly braces e.g. {{MY_VARIABLE_NAME}}. Change out the braces for whichever symbol/character you are using or add/remove more. E.g. [[MY_VARIABLE_NAME]] would be matched with \[\...

This is validation that is used in html5 for validate the url. http://www.faqs.org/rfcs/rfc3987.html

This will match a word that is not wrapper by the a specified HTML element (with a class).

Extracts HTML tags, HTML entities, alphanumeric words, and the rest.

Capture group one is the tag's name, capture group two is the tag's contents.

Matches HTML entities like <

This regex will find all attributes, values, and the equal operator, as well as the white space between attributes. You can use this to extract all attributes to remove all inline styles.

valida fechas de 19## a 20##, en formato yyyy-MM-dd

It fiters plain text from plain text + html content, the input has the shape: "plain text html content" It keeps only the plain text at the beginning.

My html tag regex

This will match all four-digit years that are leap years, using the "either (multiple of four but not a multiple of 100) OR (multiple of 400)" rule. Explained / ^(...

Visa, MasterCard, American Express, Diners Club, Discover, JCB

HTML CODE given by (hex number   OR number &#160 OR name  )