Regular Expressions 101

^start of line

Non-Capturing Group(?:(?!.*b)(?<pre1>.*)|(?<pre2>.*)(b(?!c))(?<post>.*))

1st Alternative(?!.*b)(?<pre1>.*)

Negative Lookahead(?!.*b)

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

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

Group pre1(?<pre1>.*)

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

2nd Alternative(?<pre2>.*)(b(?!c))(?<post>.*)

Group pre2(?<pre2>.*)

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

Group 3(b(?!c))

bthe literal b (98₁₀ / 142₈ / 62₁₆) (case sensitive)

Negative Lookahead(?!c)

cthe literal c (99₁₀ / 143₈ / 63₁₆) (case sensitive)

Group post(?<post>.*)

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

$end of line

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^(?:(?!.*b)(?<pre1>.*)|(?<pre2>.*)(b(?!c))(?<post>.*))$

New

abcd
abd
ad

$<pre1>$<pre2>$<post>bc