Regular Expressions 101

^start of line

Group 1(\h*const\s+filename\s*=\s*)

\h*any horizontal whitespace character, repeated any number of times

constthe literal text const (case insensitive)

\s+any whitespace character, repeated at least once

filenamethe literal text filename (case insensitive)

\s*any whitespace character, repeated any number of times

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\s*any whitespace character, repeated any number of times

.+any character (except for line terminators), repeated at least once

Global pattern flags

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

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

Regular Expression

^(\h*const\s+filename\s*=\s*).+

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