ugrep (ug) is a file pattern searcher, it is a more powerful, ultra fast, user-friendly, compatible grep (that is also completely free!). ugrep is written in c++.
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July 20, 2024
ugrep "cpp" a_file
-r
ugrep -r "cpp" .
-I
ugrep -r -I "cpp" .
Many options mix together
ugrep -rI "cpp" .
-n
ugrep -rIn "cpp" .
For simple search, quotes can be empty.
ugrep -rIn cpp .
-l
ugrep -rIl cpp .
-v
ugrep -rInv cpp .
-i
ugrep -rIni cpp .
ugrep "^cpp" a_file
options can be also used.
ugrep -rIn "^cpp" .
Ignore case option can be used too.
ugrep -rIni "^cpp" .
ugrep -rIn "cpp$" .
a dot: .
ugrep -rIn ".pp" .
Matched:
cpp
hpp
upp
...
Three dots
ugrep -rIn "...cpp" . ugrep -rIn "cpp..." .
ugrep -rIn "[hc]pp" .
It will search hpp or cpp .
Match any one character of the alphabet or numeric table
ugrep -rIn "[a-z]cpp" . ugrep -rIn "[A-Z]cpp" . ugrep -rIn "[0-9]cpp" . ugrep -rIn "[a-zA-Z]cpp" . ugrep -rIn "[a-zA-Z0-9]cpp" . ugrep -rIn "fx[0-9][0-9]" .
utx::fx32 will match above.
Match not any one of
ugrep -rIn "[^a-zA-Z]cpp" .
Don't be confused, this will match any lines that begin with alphabet:
ugrep -rIn "^[a-zA-Z]" .
Match one uppercase
ugrep -rIn "[[:upper:]]" .
Match one lowercase
ugrep -rIn "[[:lower:]]" .
Match one digit
ugrep -rIn "[[:digit:]]" .
Match a space
including \n, \r, \t, \v
ugrep -rIn "[[:space:]]" .
Match one visible character, including space
ugrep -rIn "[[:print:]]" .
ugrep -rIn "([A-Z]*)" . ugrep -rIn "[A-Z]*" .
ugrep -rIn "([A-Z]+)" . ugrep -rIn "(cpp[a-z]+)" . # Matched: cppfx cppreference ... ugrep -rIn "cpp([a-z]+)" .
ugrep -rIn "[A-Z]+" . ugrep -rIn "cpp[a-z]+" . # Matched: cppfx cppreference ...
ugrep -rIn "i[0-9]?" .
() are used for grouping sometimes.
ugrep -rIn ".*" .
\
Escape grouping
ugrep -rIn "\(void\)" . # Match (void) ugrep -rIn "(void)" . # Match void ugrep -rIn "void" . # Match void
Match any one word of
ugrep -rIn "(powered|Powered)" . # Match powered or Powered
ugrep -rIn "(cpp)?fx" . # Match cppfx or fx
Match include following one or more space .
ugrep -rIn "include[[:space:]]+" .
Match p or x or i that repeats 3 times: ppp, iii, xxx, ppi, pip, ipp, ...
ugrep -rIn "[pxi]{3}" .
Match alphabet that repeats 3~5 tmes.
ugrep -rIn "[[:alpha:]]{3,5}" .
.*
Match any character that repeats any times
\.
Match a dot
ugrep -rIn ".*\." . # a dot must be the last of the matched string. ugrep -rIn ".*\.$" . # a dot must be the very ending of the matched line.
Match a line that must begin with #include <, and end with .hpp>, and zero or more blank space can be existed between #include and <
ugrep -rIn "^#include[ ]*<.*\.hpp>$" .
Match a word that has three characters, and the characters must be a, b, u, v, w, x, y, or z, such as: abu aaa uba uaz www uby
ugrep -rIn "[abu-z]{3}" .
[Official ugrep regex table]
. any character except \n
a the character a
ab the string ab
a|b a or b
a* zero or more a's
a+ one or more a's
a? zero or one a
a{3} 3 a's
a{3,} 3 or more a's
a{3,7} 3 to 7 a's
a*? zero or more a's lazily
a+? one or more a's lazily
a?? zero or one a lazily
a{3}? 3 a's lazily
a{3,}? 3 or more a's lazily
a{3,7}? 3 to 7 a's lazily
\. escapes . to match .
\Q...\E the literal string ...
\f form feed
\n newline
\r carriage return
\R any Unicode line break
\t tab
\v vertical tab
\X any character and \n
\cZ control character ^Z
\0 NUL
\0ddd octal character code ddd
\xhh hex character code hh
\x{hhhh} Unicode code point U+hhhh
\u{hhhh} Unicode code point U+hhhh
[abc-e] one character a,b,c,d,e
[^abc-e] one char not a,b,c,d,e,\n
[[:alnum:]] a letter or decimal digit
[[:alpha:]] a lower or uppercase letter
[[:ascii:]] ASCII char \x00-\x7f
[[:blank:]] a space or a tab
[[:cntrl:]] a control character
[[:digit:]] a decimal digit
[[:graph:]] a visible character
[[:lower:]] a lowercase letter
[[:print:]] a visible char or space
[[:punct:]] a punctuation character
[[:space:]] a space,\t,\v,\f,\r
[[:upper:]] an uppercase letter
[[:word:]] a word-like character
[[:xdigit:]] a hexadecimal digit
\p{Class} one character in Class
\P{Class} one char not in Class
\d a decimal digit
\D a non-digit character
\h a space or a tab
\H not a space or a tab
\l a lowercase letter
\L a non-lowercase character
\s a whitespace except \n
\S a non-whitespace
\u an uppercase letter
\U a non-uppercase character
\w a word-like character
\W a non-word character
^ begin of line anchor
$ end of line anchor
\A begin of file anchor
\Z end of file anchor
\b word boundary
\B non-word boundary
\< start of word boundary
\> end of word boundary
(?=...) lookahead (-P)
(?!...) negative lookahead (-P)
(?<=...) lookbehind (-P)
(?<!...) negative lookbehind (-P)
(...) capturing group (-P)
(...) non-capturing group
(?:...) non-capturing group
(?<X>...) capturing, named X (-P)
\1 matches group 1 (-P)
\g{10} matches group 10 (-P)
\g{X} matches group name X (-P)
(?#...) comments ... are ignored
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