Regular Expressions 101

^start of line

Non-Capturing Group(?:(?<S>((?<W>[^\x20\.\r\n]*)\x20)*\g<W>\.|$\g<W>((\x20\g<W>)*)?$)(\x20\g<S>)*)?

?repeats the group contents below at most once:

Group S(?<S>((?<W>[^\x20\.\r\n]*)\x20)*\g<W>\.|$\g<W>((\x20\g<W>)*)?$)

1st Alternative((?<W>[^\x20\.\r\n]*)\x20)*\g<W>\.

Group 2((?<W>[^\x20\.\r\n]*)\x20)*

*repeats the group contents below any number of times:

Group W(?<W>[^\x20\.\r\n]*)

Negated Character Class[^\x20\.\r\n]*

*matches any number of characters outside the set below:

\x20the literal (20₁₆ / 40₈ / 32₁₀)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\ra carriage return (ASCII 13)

\na line-feed (newline) character (ASCII 10)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

\x20the literal (20₁₆ / 40₈ / 32₁₀)

\g<W>calls group W as a subroutine

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative$\g<W>((\x20\g<W>)*)?$

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\g<W>calls group W as a subroutine

Group 4((\x20\g<W>)*)?

?repeats the group contents below at most once:

Group 5(\x20\g<W>)*

*repeats the group contents below any number of times:

\x20the literal (20₁₆ / 40₈ / 32₁₀)

\g<W>calls group W as a subroutine

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Group 6(\x20\g<S>)*

*repeats the group contents below any number of times:

\x20the literal (20₁₆ / 40₈ / 32₁₀)

\g<S>calls group S as a subroutine

$end of line

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?:(?<S>((?<W>[^\x20\.\r\n\(\)]*)\x20)*\g<W>\.|\(\g<W>((\x20\g<W>)*)?\))(\x20\g<S>)*)?$

Este é o meu texto. Eu sou lindo e irresistível. (Versão portuguesa)
This is my text. I'm beautiful and irresistible. (English version)