Regular Expressions 101

1st Alternative(^(11)(?:,))

Group 1(^(11)(?:,))

^start of line

Group 2(11)

11the literal text 11

Non-Capturing Group(?:,)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

2nd Alternative((?<=,)(11)(?:,))

Group 3((?<=,)(11)(?:,))

Positive Lookbehind(?<=,)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

Group 4(11)

11the literal text 11

Non-Capturing Group(?:,)

,the literal , (44₁₀ / 54₈ / 2C₁₆)

3rd Alternative(,11$)

Group 5(,11$)

,11the literal text ,11

$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

(^(11)(?:,))|((?<=,)(11)(?:,))|(,11$)

New

11,11,22,33,56711,4114,55,6611
11,45611,22,11,33,44
22,1133,611,44,55,66,11