Regular Expressions 101

1st Alternative(\d{3}) - (\d{8}) #region code, -, phone number

Group 1(\d{3})

\d{3}a digit, repeated exactly 3 times

- the literal text -

Group 2(\d{8})

\d{8}a digit, repeated exactly 8 times

Comment:region code, -, phone number

2nd Alternative #alternative (\d{4}) - (\d{7,8})#region code, -, phone number

Comment:alternative

Group 3(\d{4})

\d{4}a digit, repeated exactly 4 times

- the literal text -

Group 4(\d{7,8})

\d{7,8}a digit, repeated between 7 and 8 times

Comment:region code, -, phone number

Global pattern flags

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

x modifier: extended. Ignores unescaped whitespace and comments outside character classes

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(\d{3}) - (\d{8}) #region code, -, phone number
| #alternative
(\d{4}) - (\d{7,8})#region code, -, phone number

021-54749110 
0531-88881234
0635-8238080