Starts with Alphabet but may contains numbers and underscore _

Pattern that only accept numeric value and greater than zero with up to decimal places( you can change the decimal places just replace {1,2} depend on how many decimal places you like

Matches alphanumeric slugs without repeating dashes

Allow get the value of the some attributes from a html text

Simple check on the correct format of a time stamp including time zone information

Uses a single string to match any node require variables

For better exception capturing

Key/Value pairs with multiline support

13 fields, 12 comma's from right (all left hand ones need to be ignored as they're part of the sql statements)

sdsada

I use this to extract and later calculate the difference between two times.

URL validation with http/https

This will parse the fields portion of a mysqldump lines such as: INSERT INTO users VALUES (42,'Bob',12.34,NULL,'It\'s ok!');

Regex For finding username:password

Detects valid Roman numerals (up to 3999), and splits into 4 capture groups: thousands, hundreds, tens, and units.