regex101: PCRE (Legacy) Substitution Workspace

^start of line

Character Class[\*]

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

.+?any character, repeated at least once

SemprePresente1=the literal text SemprePresente1= (case sensitive)

Group 1(\d{2}\/\d{4})

\d{2}a digit, repeated exactly 2 times

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

\d{4}a digit, repeated exactly 4 times

.+?any character, repeated at least once

SemprePresente2=the literal text SemprePresente2= (case sensitive)

Group 2(\d{6})

\d{6}a digit, repeated exactly 6 times

Non-Capturing Group(?:(?!Opcional=)[^\*])+

+repeats the group contents below at least once:

Negative Lookahead(?!Opcional=)

Opcional=the literal text Opcional= (case sensitive)

Negated Character Class[^\*]

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

Group 3(Opcional=(\d+,\d+))?

?repeats the group contents below at most once:

Opcional=the literal text Opcional= (case sensitive)

Group 4(\d+,\d+)

\d+a digit, repeated at least once

,the literal , (44₁₀ / 54₈ / 2C₁₆)

\d+a digit, repeated at least once

Negated Character Class[^\*]+

+matches at least one character outside the set below:

\*the literal * (42₁₀ / 52₈ / 2A₁₆)

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

Search reference

Regular Expression

^[\*].+?SemprePresente1=(\d{2}\/\d{4}).+?SemprePresente2=(\d{6})(?:(?!Opcional=)[^\*])+(Opcional=(\d+,\d+))?[^\*]+

New

********************
SemprePresente1=09/2019
SemprePresente2=987456
Um monte de coisas  
Que não preciso
Opcional=698,00
Mais coisas que não preciso
********************
SemprePresente1=06/2019
SemprePresente2=123658
Um monte de coisas 
Que não preciso
********************
SemprePresente1=09/2019
SemprePresente2=987699
Um monte de coisas
Opcional=9999,00
Mais coisas que não preciso

Regular Expressions 101

Regular Expression

Extraction