Regular Expressions 101

Positive Lookahead(?=[\s\S]*\berror\b)

Character Class[\s\S]*

*matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

\ban ASCII word boundary

errorthe literal text error (case sensitive)

\ban ASCII word boundary

Positive Lookahead(?=[\s\S]*\balarm\b)

Character Class[\s\S]*

*matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

\ban ASCII word boundary

alarmthe literal text alarm (case sensitive)

\ban ASCII word boundary

Character Class[\s\S]*

*matches any number of characters from the set below:

\sany whitespace character

\Sany non-whitespace character

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?=[\s\S]*\berror\b)(?=[\s\S]*\balarm\b)[\s\S]*

New

ns1.alarm.abc
ns2.error.cdb