Exceptions to Regular Expressions

The creation of regular expressions for the Compliance Filter differs from the creation of PCRE-compliant expressions because not all syntax elements can be used.

None of the syntax elements listed below can be used to create rules with regular expressions for the Compliance Filter:

  • Square brackets []
  • Curly brackets {}
  • Only one group with parentheses () can be formed.
  • Quotation mark "
  • Semicolon ;
  • Apostrophe '
  • Circumflex ^
  • Grave accent `
  • Tilde ~
  • Degree sign °
  • Dollar sign $
  • Asterisk * at the beginning of an entry
  • Slash /
Note:

The vertical bar | is only allowed inside a group between parentheses.

In addition, regular expressions are case-insensitive.