regex101: PCRE (Legacy) Match Workspace

^start of line

EMISSAO="the literal text EMISSAO=" (case sensitive)

Condition(?(?!(19\d{2}|20(0\d|1[0-7]))-\d{2}-\d{2}).*|)

Uses the first branch if the lookaround matches

Negative Lookahead(?!(19\d{2}|20(0\d|1[0-7]))-\d{2}-\d{2})

Group 1(19\d{2}|20(0\d|1[0-7]))

1st Alternative19\d{2}

19the literal text 19

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

2nd Alternative20(0\d|1[0-7])

20the literal text 20

Group 2(0\d|1[0-7])

1st Alternative0\d

0the literal 0 (48₁₀ / 60₈ / 30₁₆)

\da digit

2nd Alternative1[0-7]

1the literal 1 (49₁₀ / 61₈ / 31₁₆)

Character Class[0-7]

0-7one character from 0 (48₁₀) to 7 (55₁₀)

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

-the literal - (45₁₀ / 55₈ / 2D₁₆)

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

If the condition is true, match this branch:.*

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

Otherwise, match this branch: — matches an empty string

$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

25 tokens

Regular Expression

^EMISSAO="(?(?!(19\d{2}|20(0\d|1[0-7]))-\d{2}-\d{2}).*|)$

New

EMISSAO="2017-04-18 00:00:00" // passa
EMISSAO="1990-04-18 00:00:00" // passa
EMISSAO="2016-04-18 00:00:00" // passa
EMISSAO="2015-04-18 00:00:00" // passa
EMISSAO="2017-04-18 00:00:00" // passa
EMISSAO="2016-04-18 00:00:00" // passa
EMISSAO="2018-04-18 00:00:00" // não passa
EMISSAO="22000 00:00:00" // não passa
EMISSAO="65321-04-18 00:00:00" // não passa
EMISSAO="5069 00:00:00" //não passa
EMISSAO="2018 00:00:00" //não passa
EMISSAO="2019 00:00:00" //não passa
EMISSAO="2020 00:00:00" //não passa
EMISSAO="2019 00:00:00" //não passa
EMISSAO=" 00:00:00" //não passa
EMISSAO="2012-1-12 00:00:00" // não passa
EMISSAO="20123-11-12 00:00:00" // não passa

EMISSAO="2001-04-18 00:00:00"
EMISSAO="2007-04-18 00:00:00"
EMISSAO="2008-04-18 00:00:00"
EMISSAO="2009-04-18 00:00:00" 
EMISSAO="2010-04-18 00:00:00" 
EMISSAO="2011-04-18 00:00:00" 
EMISSAO="2012-04-18 00:00:00" 
EMISSAO="2016-04-18 00:00:00" 
EMISSAO="2017-04-18 00:00:00" 
EMISSAO="2018-04-18 00:00:00" 

EMISSAO="2016-04-18 asdfgsadfgosagfasiudfoi

Regular Expressions 101

Regular Expression

Substitution