Regular ExpressionsThe text in the box to the left of the help link you just clicked is a regular expression. It is a codified expression that defines a specific set of character sequences. For example, the default text, "^[0-9][A-Z][0-9]+$", in English means "The beginning of the line followed by one digit followed by one capital letter followed by one or more digits followed by the end of the line," which is one standard for naming chemicals.For a more detailed explanation of regular expressions and how to create them, click here. |