Regular Expressions 101

1st Alternative(?m)(?:^.*\.$|$[^()]*$|if\(.*?\/\/endif)(*SKIP)(*F)

(?m)applies the following effective flags to the remainder of the pattern: gm

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

Non-Capturing Group(?:^.*\.$|$[^()]*$|if\(.*?\/\/endif)

1st Alternative^.*\.$

^start of line

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

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

$end of line

2nd Alternative$[^()]*$

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

Negated Character Class[^()]*

*matches any number of characters outside the set below:

(the literal ( (40₁₀ / 50₈ / 28₁₆)

)the literal ) (41₁₀ / 51₈ / 29₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

3rd Alternativeif\(.*?\/\/endif

ifthe literal text if (case sensitive)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

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

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

endifthe literal text endif (case sensitive)

(*SKIP)acts like (*PRUNE), but the next unanchored match attempt starts where (*SKIP) was reached instead of at the next subject character

(*F)forces the current match attempt to fail at this position

2nd Alternative\b\d+\b

\ban ASCII word boundary

\d+a digit, repeated at least once

\ban ASCII word boundary

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

Regular Expression

(?m)(?:^.*\.$|\([^()]*\)|if\(.*?\/\/endif)(*SKIP)(*F)|\b\d+\b

New

cat 123 sat.
I like 000 not (456) though 111 is fine
222 if(  //endif if(cat==789 stuff  //endif   333