Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!%)

%the literal % (37₁₀ / 45₈ / 25₁₆)

Non-Capturing Group(?:.*\\document(?:class|style).*)

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

\\the literal \ (92₁₀ / 134₈ / 5C₁₆)

documentthe literal text document (case sensitive)

Non-Capturing Group(?:class|style)

1st Alternativeclass

classthe literal text class (case sensitive)

2nd Alternativestyle

stylethe literal text style (case sensitive)

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

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25 tokens

^(?!%)(?:.*\\document(?:class|style).*)

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