Manual:Regular Expressions

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

"()" 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

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