Generate a regular expression that can match strings of any length consisting of only the letters a,b and c
The regular expression that can match strings of any length consisting of only the letters a, b, and c is: 

`^[abc]+$`
Complete the following task based on the instruction and optional input provided.### Instruction:
Generate a regular expression that can match strings of any length consisting of only the letters a,b and c

### Output:
The regular expression that can match strings of any length consisting of only the letters a, b, and c is: 

`^[abc]+$`