Repetition Characters in Regular Expressions

IN THIS PAGE

Description

Covers the special characters {n}, {n,}, {n,m}, ?, *, and +

{n}

{n,}

{n,m}

Match at least n and at most m of the previous item
```
a(1,3} matches a, aa, aaa
```

Match the previous item one or more times
```
a+ matches a, aa, aaa, aaaa, etc.
```

Match the previous item zero or more times

a* matches nothing, a, aa, aaa, aaaa, etc.

This example looks for a telephone number. The area code must be enclosed in parentheses and there also must be a hyphen.

? regex_split("Our phone number is (781)229-4500.", "(\(\d{3}\)\d{3}-\d{4})")
= "(781)229-4500"

This example looks for the area code telephone number.

? regex_split("Our phone number is (781)229-4500.", "(\(\w{3}\))")
= "(781)"

This example looks for value of a dollar amount.

? regex_split("the price is $123456.78.", "(\d+.\d+)")
= "123456.78"