Regular Expressions 101

Positive Lookbehind(?<=class\s)

classthe literal text class (case sensitive)

\sany whitespace character

\s*any whitespace character, repeated any number of times

Group 1(.+?)

.+?any character (except for line terminators), repeated at least once

Positive Lookahead(?=\s*\{)

\s*any whitespace character, repeated any number of times

\{the literal { (123₁₀ / 173₈ / 7B₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(?<=class\s)\s*(.+?)(?=\s*\{)

New

class Mango {
class mango
mango {
class  _Mango$    {
class ‿Mango{
class mango{
class                   mango               {