Regular Expressions 101

Group 1((?<=\s)[^.]+(pattern)[^.]+(sentence)(?=\.)|(?<=\s)[^.]+(sentence)[^.]+(pattern)(?=\.))

1st Alternative(?<=\s)[^.]+(pattern)[^.]+(sentence)(?=\.)

Positive Lookbehind(?<=\s)

\sany whitespace character

Negated Character Class[^.]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(pattern)

patternthe literal text pattern (case sensitive)

Negated Character Class[^.]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 3(sentence)

sentencethe literal text sentence (case sensitive)

Positive Lookahead(?=\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative(?<=\s)[^.]+(sentence)[^.]+(pattern)(?=\.)

Positive Lookbehind(?<=\s)

\sany whitespace character

Negated Character Class[^.]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 4(sentence)

sentencethe literal text sentence (case sensitive)

Negated Character Class[^.]+

+matches at least one character outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 5(pattern)

patternthe literal text pattern (case sensitive)

Positive Lookahead(?=\.)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

((?<=\s)[^.]+(pattern)[^.]+(sentence)(?=\.)|(?<=\s)[^.]+(sentence)[^.]+(pattern)(?=\.))

New

Find the pattern when it is. In the same sentence. Find the pattern when it is in the same sentence. Find the sentence when it is in the same pattern.

Regular Expression

Substitution