regex101: PCRE (Legacy) Match Workspace

^start of line

Comment: Match start of line

Condition(?(?=■).*\n|. # Test if first character is a ■. If not match one of anything (?(?=■).*\n|. # Test if second character is a ■. If not match one of anything (?(?=■).*\n|. # Test if third character is a ■. If not match one of anything (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).).).).).)

Uses the first branch if the lookaround matches

Positive Lookahead(?=■)

■the literal ■ (9632₁₀ / 22640₈ / 25A0₁₆)

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

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

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

Otherwise, match this branch:. # Test if first character is a ■. If not match one of anything (?(?=■).*\n|. # Test if second character is a ■. If not match one of anything (?(?=■).*\n|. # Test if third character is a ■. If not match one of anything (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).).).).).

.any character (except for line terminators)

Comment: Test if first character is a ■. If not match one of anything

Condition(?(?=■).*\n|. # Test if second character is a ■. If not match one of anything (?(?=■).*\n|. # Test if third character is a ■. If not match one of anything (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).).).).)

Uses the first branch if the lookaround matches

Positive Lookahead(?=■)

■the literal ■ (9632₁₀ / 22640₈ / 25A0₁₆)

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

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

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

Otherwise, match this branch:. # Test if second character is a ■. If not match one of anything (?(?=■).*\n|. # Test if third character is a ■. If not match one of anything (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).).).).

.any character (except for line terminators)

Comment: Test if second character is a ■. If not match one of anything

Condition(?(?=■).*\n|. # Test if third character is a ■. If not match one of anything (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).).).)

Uses the first branch if the lookaround matches

Positive Lookahead(?=■)

■the literal ■ (9632₁₀ / 22640₈ / 25A0₁₆)

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

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

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

Otherwise, match this branch:. # Test if third character is a ■. If not match one of anything (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).).).

.any character (except for line terminators)

Comment: Test if third character is a ■. If not match one of anything

Condition(?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).).)

Uses the first branch if the lookaround matches

Positive Lookahead(?=■)

■the literal ■ (9632₁₀ / 22640₈ / 25A0₁₆)

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

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

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

Otherwise, match this branch:. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).).

.any character (except for line terminators)

Comment: and so on...

Condition(?(?=■).*\n|. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).)

Uses the first branch if the lookaround matches

Positive Lookahead(?=■)

■the literal ■ (9632₁₀ / 22640₈ / 25A0₁₆)

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

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

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

Otherwise, match this branch:. # and so on... (?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).).

.any character (except for line terminators)

Comment: and so on...

Condition(?(?=■).*\n|. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).)

Uses the first branch if the lookaround matches

Positive Lookahead(?=■)

■the literal ■ (9632₁₀ / 22640₈ / 25A0₁₆)

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

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

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

Otherwise, match this branch:. # and so on... (?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .).

.any character (except for line terminators)

Comment: and so on...

Condition(?(?=■).*\n|■ # Test if the next to last character is a !. Force a failed (match ■) .)

Uses the first branch if the lookaround matches

Positive Lookahead(?=■)

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

Otherwise, match this branch:■ # Test if the next to last character is a !. Force a failed (match ■) .

.any character (except for line terminators)

Comment: "On the way out" of the match, "eat" characters on the next line

Group 1(.)

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

$end of line

Comment: Capture the character and match the rest of the 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

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

Search reference

Regular Expression

^               # Match start of line
(?(?=■).*\n|.   # Test if first character is a ■. If not match one of anything
(?(?=■).*\n|.   # Test if second character is a ■. If not match one of anything
(?(?=■).*\n|.   # Test if third character is a ■. If not match one of anything
(?(?=■).*\n|.   # and so on...
(?(?=■).*\n|.   # and so on...
(?(?=■).*\n|.   # and so on...
(?(?=■).*\n|■   # Test if the next to last character is a !. Force a failed (match ■)
.).).).).).).)  # "On the way out" of the match, "eat" characters on the next line
(.).*$          # Capture the character and match the rest of the line

Unit Tests

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