Regular Expressions 101

index:the literal text index: (case sensitive)

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

Group 1([0-9]+)

Character Class[0-9]+

+matches at least one character from the set below:

0-9one character from 0 (48₁₀) to 9 (57₁₀)

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

,the literal , (44₁₀ / 54₈ / 2C₁₆)

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

index:\s*([0-9]+)\s*,

New

node v10.15.2 linux/amd64

 [ 'b', index: 4, input: '++a+b+c++', groups: undefined ] 'hello'
 [ 'c', index: 6, input: '++a+b+c++', groups: undefined ] 'hello'
 Separating top and bottom so it's easier to read
 [ 'a', index: 2, input: '++a+b+c++', groups: undefined ]
 [ 'b', index: 4, input: '++a+b+c++', groups: undefined ]
 [ 'c', index: 6, input: '++a+b+c++', groups: undefined ]

Regular Expression

Extraction