Regular Expressions 101

Positive Lookahead(?=^test\s+.*|.*?\s+test\s+.*?|.*?\s+test$)

1st Alternative^test\s+.*

^start of string

testthe literal text test (case sensitive)

\s+any whitespace character, repeated at least once

.*any character (except for line terminators), repeated any number of times

2nd Alternative.*?\s+test\s+.*?

.*?any character (except for line terminators), repeated any number of times

\s+any whitespace character, repeated at least once

testthe literal text test (case sensitive)

\s+any whitespace character, repeated at least once

.*?any character (except for line terminators), repeated any number of times

3rd Alternative.*?\s+test$

.*?any character (except for line terminators), repeated any number of times

\s+any whitespace character, repeated at least once

testthe literal text test (case sensitive)

$end of string, or before its final line terminator

.*any character (except for line terminators), repeated any number of times

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25 tokens

Regular Expression

(?=^test\s+.*|.*?\s+test\s+.*?|.*?\s+test$).*

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