regex101: PCRE2 (PHP) Match Workspace

^start of line

Group request(?'request'.+?)

.+?any character (except for line terminators), repeated at least once

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

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

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Condition(?(?=(.*,.*))(((?'block'.*)?[,.](?'stain'.*)?)?)|((?'block'.*)?))

Uses the first branch if the lookaround matches

Positive Lookahead(?=(.*,.*))

Group 2(.*,.*)

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

If the condition is true, match this branch:(((?'block'.*)?[,.](?'stain'.*)?)?)

Group 3(((?'block'.*)?[,.](?'stain'.*)?)?)

Group 4((?'block'.*)?[,.](?'stain'.*)?)?

?repeats the group contents below at most once:

Group block(?'block'.*)?

?repeats the group contents below at most once:

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

Character Class[,.]

,the literal , (44₁₀ / 54₈ / 2C₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group stain(?'stain'.*)?

?repeats the group contents below at most once:

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

Otherwise, match this branch:((?'block'.*)?)

Group 7((?'block'.*)?)

Group block(?'block'.*)?

?repeats the group contents below at most once:

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

Global pattern flags

J modifier: Allow duplicate subpattern names

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Search reference

Regular Expression

^(?'request'.+?);.*](?(?=(.*,.*))(((?'block'.*)?[,.](?'stain'.*)?)?)|((?'block'.*)?))

New

12345-21;[65]1A,HE
12345-21;[65]1A,
12345-21;[65]1A
12345-21;[65],HE
12345-21;[65],
12345-21;[65]
12345-21;
12345-21,
A_12345-21;[65]1A,HE
A_12345-21;[65]1A,
A_12345-21;[65]1A
A_12345-21;[65],HE
A_12345-21;[65],
A_12345-21;[65]
12345-21;
12345-21,
A.12345-21;[65]1A,HE
A.12345-21;[65]1A,
A.12345-21;[65]1A
A.12345-21;[65],HE
A.12345-21;[65],
A.12345-21;[65]
12345-21;
12345-21,
A.12345-21;[65]1PCS1,Ki-67
A.12345-21;[65]1A,
A.12345-21;[65]1A
A.12345-21;[65],HE
A.12345-21;[65],
A.12345-21;[65]
12345-21;
12345-21,

Regular Expressions 101

Regular Expression

Substitution