Regular Expressions 101

(?i)applies the following effective flags to the remainder of the pattern: gmi

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

^start of line

chapter the literal text chapter (case insensitive)

Character Class[\divxlc]+

+matches at least one character from the set below:

\da digit

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

vthe literal v (118₁₀ / 166₈ / 76₁₆) (case insensitive)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case insensitive)

lthe literal l (108₁₀ / 154₈ / 6C₁₆) (case insensitive)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case insensitive)

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

(?i)^chapter [\divxlc]+

New

chapter 1245
chapter iiixxx
chapter iCiVxX