Manual:Regular Expressions

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RouterOS support POSIX regular expression syntax (POSIX standard), with some exceptions:

  • '{}' bounds are not supported;
  • "()" must not be empty;
  • equivalence classes are not supported ("[[.ch.]]");
  • collating elements are not supported ("[[=a=]b]");
  • matching is done in single pass, no backtracking.

Following services in RouterOS are using Regexps:

  • firewall L7 matchers
  • BGP filters
  • CAPSMAN provisioning
  • TFTP
  • Web Proxy
  • Hotspot Walled Garden
  • DNS
  • Console with '~' operator