Regular Expressions 101

filenamethe literal text filename (case sensitive)

Negated Character Class[^;\n=]*

*matches any number of characters outside the set below:

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

\na line-feed (newline) character (ASCII 10)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Group 1((['"]).*?\2|[^;\n]*)

1st Alternative(['"]).*?\2

Group 2(['"])

Character Class['"]

'the literal ' (39₁₀ / 47₈ / 27₁₆)

"the literal " (34₁₀ / 42₈ / 22₁₆)

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

\2the text saved by group 2

2nd Alternative[^;\n]*

Negated Character Class[^;\n]*

*matches any number of characters outside the set below:

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

\na line-feed (newline) character (ASCII 10)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

filename[^;\n=]*=((['"]).*?\2|[^;\n]*)

Test String
New

attachment; filename=content.txt
attachment; filename*=UTF-8''filename.txt
attachment; filename="EURO rates"; filename*=utf-8''%e2%82%ac%20rates
attachment; filename="omÃ¡Ã¨ka.jpg"

Regular Expression

Test StringNew

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Test String
New

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