Valida se é um CPF ou um CNPJ válido, independente da máscara

Selects Xml version and Encoding and whitespaces

phone number without spaces or hyphens +7YYYXXXXXXX

Parses a URL query string (ignores anything after #) and returns parameters and values separately.

Accepts only integer or Flating values upto 3 decimals. To accept n decimals change (1,n)

Match any alphanumeric string in any language. White spaces are allowed. (Usefull for ECMAScript 5)

Positive or negative. 0 is allowed but may not be a leading digit.

Detect various possible HTML linebreak tags (eg. )

Awesome explanation of nested lookbacks

Only captures value for converting percentage to decimal. Returns empty if percentage but no value. no match = no percentage found

Requirement was to check if there is space between . and next text and if not the then add space

Splitting file names