Characters

You can use the following special characters when creating a regular expression.

Character Examples

The following examples illustrate how to use regular expressions.

any two-character string

..--matches any two characters

upper and lower case

[Ww]arning--matches Warning or warning.

exclusion

[^a-zA-Z]--matches anything except uppercase and lowercase letters.

a character followed by zero or more occurrences of a character

st*--matches a string that contains an s followed by zero or more t's.

repeated sequences

(st)+--matches a string that has one or more sequences of st.

anything

.*--matches anything.

word regardless of case

warning
|Warning--matches warning or Warning.

space or tabs that precede a string

^[ \t]+--matches any string that begins with spaces or tabs.