Character Classes or Character Sets are used to define a list of characters to be used inside a RegEx.
Represented using square brackets […]
Characters inside the square brackets are “case sensitive”.
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Character class
Matches (one character)
More details
[abc]
a or b or c
[AbXd]
A or b or X or d
[a-f]
lower a to lower f => a or b or c or d or f
Hyphen “-” defines the range
[a-zA-Z0-9]
lower a to lower z OR
upper A to upper Z OR
digit 0 to digit 9
Multiple Hyphens are used for multiple range lists
[^abc]
NOT a and NOT b and not C
^ is used for “NOT” equals to
[a-d[m-p]]
lower a to lower d OR
lower m to lower p
UNIOIN
[a-g&&[efghij]]
e or f or g
Intersection
[1-3&&[3-6]]
3
Intersection
[a-z&&[^bc]]
a or ( d to z) ==>
a-z but not ( b or c)
Subtraction
Examples
Source Text
RegEx
Match found ?
Details
telegram
[ab]
YES
This RegEx tries to match if source text contains either character “a”, or “b”.
call007 now
[0-9]
YES
This RegEx tries to match if source text contains any digit from 0 to 9.