Regular Expressions 101

Positive Lookbehind(?<=;Password=)

;Password=the literal text ;Password= (case insensitive)

Non-Capturing Group(?:(?!;[\w ]+=).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!;[\w ]+=)

;the literal ; (59₁₀ / 73₈ / 3B₁₆)

Character Class[\w ]+

+matches at least one character from the set below:

\wany word character

the literal (32₁₀ / 40₈ / 20₁₆)

=the literal = (61₁₀ / 75₈ / 3D₁₆)

.any character (except for line terminators)

Global pattern flags

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

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<=;Password=)(?:(?!;[\w ]+=).)*

New

add key="myKey" value="Data Source=MyDataSource;Initial Catalog=MyDB;User ID=test-user;Password=pA&-pass; unicode=True"
add key="myKey" value="Data Source=MyDataSource;Initial Catalog=MyDB;User ID=test-user;Password=pass&gt;; unicode=True"

Regular Expression

Substitution