Regular Expressions 101

The the literal text The (case sensitive)

Non-Capturing Group(?:first|second)

1st Alternativefirst

firstthe literal text first (case sensitive)

2nd Alternativesecond

secondthe literal text second (case sensitive)

section of this article focuses on modern digital electronic computers and their designthe literal text section of this article focuses on modern digital electronic computers and their design (case sensitive)

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

The (?:first|second) section of this article focuses on modern digital electronic computers and their design

Test String
New

Computer once meant a person who did computations, but now the term almost universally refers to automated electronic machinery. The first section of this article focuses on modern digital electronic computers and their design

Regular Expression

Test StringNew

SubstitutionProcessing...

Test String
New

Substitution
Processing...