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• +, *, ?, {}, +?, *?, ??, {}? (These operators have the same precedence.)
• concatenation
• |
UNIX Regular Expression Examples
The table below shows examples of UNIX regular expressions.
Table 11.13. UNIX Regular Expression Examples
Sample UNIX Expression
Description
^defproc
Matches lines that begin with the word defproc.
^definit$
Matches lines that only contain the word definit.
^\*name
Matches lines that begin with the string *name. No-
tice that the backslash must prefix the special char-
acter *.
tice that the backslash must prefix the special char-
acter *.
[\t ]
Matches tab and space characters.
[\d9\d32]
Matches tab and space characters.
[\x9\x20]
Matches tab and space characters.
p.t
Matches any three letter string starting with the let-
ter p and ending with the letter t. Two possible
matches are pot and pat.
ter p and ending with the letter t. Two possible
matches are pot and pat.
s.*?t
Matches the letter s followed by any number of
characters followed by the nearest letter t. Two pos-
sible matches are seat and st.
characters followed by the nearest letter t. Two pos-
sible matches are seat and st.
for|while
Matches the strings for or while.
^\:p
Matches lines beginning with a file name.
xy+z
Matches x followed by one or more occurrences of
y followed by z.
y followed by z.
[a-z-[qw]]
Character set subtraction. Matches all English
lowercase letters except q and w.
lowercase letters except q and w.
[\p{isGreek}&[\p{L}]]
Character set intersection. Matches all Unicode let-
UNIX Regular Expressions
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