Mikroelektronika MIKROE-742 데이터 시트

You can specify a character class, by enclosing a list of characters in 

[]

, which will

match any of the characters from the list. If the first character after the

"["

is 

"^"

,

the class matches any character not in the list. 

finds strings 

'countar', 'counter'

, etc. but not

'

countbr',

'

countcr'

, etc. 

finds strings 

'

countbr', 'countcr'

, etc. but not 

'

countar'

,

'

counter'

, etc. 

Within a list, the 

"-"

character is used to specify a range, so that 

represents all

characters between

"

a"

and 

"

z"

, inclusive. 

If you want 

"-" 

itself to be a member of a class, put it at the start or end of the list,

or precede it with a backslash. 
If you want 

'

]'

, you may place it at the start of list or precede it with a backslash. 

matches 

'

a', 'z' 

and

'-' 

matches

'

a', 'z'

and

'-' 

matches 

'

a', 'z'

and 

'-' 

matches all twenty six small characters from 

'

a'

to 

'

z' 

matches any of 

. 

matches any digit, 

'-' 

or 

'

t'

. 

matches any char from 

'

]'..'a'

. 

Metacharacters are special characters which are the essence of regular expres-
sions. There are different types of metacharacters, described below.

^ 

- start of line 

- end of line 

- start of text 

- end of text 

- any character in line 

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- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 2