A regular expression is a pattern in the form of a string that describes or matches the format of expected results, according to certain rules. Below is a basic introduction to regular expressions and some patterns that are possible. ImageGear uses regular expressions to define the expected format of recognized text.

This section provides the following information:

• Regular Expressions
• • Basic Patterns (Literals)
  • Sub-Matches
  • Repetition Operators
  • Character Classes
  • • Square Bracket Character Classes
    • Backslash Character Classes
  • More Examples