Regular Expressions 101

Explanation

Pro

\ban ASCII word boundary

clientName=the literal text clientName= (case sensitive)

Group 1([^\r\n,=\[\]]+(?:,(?!\h*\w+=)[^\r\n,=\[\]]*)*)

Negated Character Class[^\r\n,=\[\]]+

+matches at least one character outside the set below:

\ra carriage return (ASCII 13)

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

Non-Capturing Group(?:,(?!\h*\w+=)[^\r\n,=\[\]]*)*

*repeats the group contents below any number of times:

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Negative Lookahead(?!\h*\w+=)

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

\w+any word character, repeated at least once

=the literal = (61₁₀ / 75₈ / 3D₁₆)

Negated Character Class[^\r\n,=\[\]]*

*matches any number of characters outside the set below:

\ra carriage return (ASCII 13)

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

\]the literal ] (93₁₀ / 135₈ / 5D₁₆)

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

No unit tests

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25 tokens

\bclientName=([^\r\n,=\[\]]+(?:,(?!\h*\w+=)[^\r\n,=\[\]]*)*)

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