regex101: PCRE2 (PHP) Match Workspace

Negative Lookbehind(?<![Ii]s)

Character Class[Ii]

Ithe literal I (73₁₀ / 111₈ / 49₁₆) (case sensitive)

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

sthe literal s (115₁₀ / 163₈ / 73₁₆) (case sensitive)

a{2,}the literal a (97₁₀ / 141₈ / 61₁₆) (case sensitive), repeated at least 2 times

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

Search reference

Regular Expression

(?<![Ii]s)a{2,}

New

Lorem ipsum dolor sit aamet, consectetur aaadipiscing elit, Isaac sed do eiusmod tempor incididunt ut labore et dolore magnaaa aliqua. Ut enim ad minim veniaaaam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat, isaac. Duis aaaaaaute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nullaaaa pariatur. Isaac excepteur sint occaecat cupidatat non proident, sunt in culpaa qui officia deserunt mollit anim id est laborum.