Regular Expressions 101

^start of line

Negative Lookahead(?!.*\bcarcinoma\b)

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

\ban ASCII word boundary

carcinomathe literal text carcinoma (case sensitive)

\ban ASCII word boundary

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

\ban ASCII word boundary

Group 1(renal|kidney)

1st Alternativerenal

renalthe literal text renal (case sensitive)

2nd Alternativekidney

kidneythe literal text kidney (case sensitive)

\ban ASCII word boundary

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

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

^(?!.*\bcarcinoma\b).*\b(renal|kidney)\b.*

New

Renal cell carcinoma
Clear cell carcinoma of kidney
Chronic renal impairment