Regular Expressions 101

Pro

Group float(?P<float>^\d+\.\d+\s)

^start of line

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\d+a digit, repeated at least once

\sany whitespace character

Group beforeTEST(?P<beforeTEST>(?:(?!(?P>float)).)*)

Non-Capturing Group(?:(?!(?P>float)).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!(?P>float))

(?P>float)calls group float as a subroutine

.any character

\ban ASCII word boundary

TESTthe literal text TEST (case sensitive)

\ban ASCII word boundary

(?P>beforeTEST)calls group beforeTEST as a subroutine

Global pattern flags

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

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

s modifier: single line. Allows a dot to match line terminators

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?P<float>^\d+\.\d+\s)(?P<beforeTEST>(?:(?!(?P>float)).)*)\bTEST\b(?P>beforeTEST)

asdasdasda
2.1 adasdasdasdasdwvwetwevtwtv
wetvwetv TEST wqrqwvrqw
qwvrqwvqwr
2.2 whergtvwe
wetvwetvwetveatw
evtwet
2.3 eyrnenytunrunert
vqevrerwv TEST aevtawtvwetv
wetvwetv TEST wqrqwvrqw

Extraction

asdasdasda
2.1 adasdasdasdasdwvwetwevtwtv
wetvwetv TEST wqrqwvrqw
qwvrqwvqwr
2.2 whergtvwe
wetvwetvwetveatw
evtwet
2.3 eyrnenytunrunert
vqevrerwv TEST aevtawtvwetv
wetvwetv TEST wqrqwvrqw