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In modern systems, these special command names are shortcuts to grep with the appropriate flags enabled. They are functionally equivalent. A regular expression is a pattern that describes a set of strings. Regular expressions are constructed analogously to arithmetic expressions, by using various operators to combine smaller expressions. In GNU grep , there is no difference in available functionality between basic and extended syntaxes. In other implementations, basic regular expressions are less powerful. The following description applies to extended regular expressions; differences for basic regular expressions are summarized afterwards.

Perl regular expressions give additional functionality. The fundamental building blocks are the regular expressions that match a single character. Most characters, including all letters and digits, are regular expressions that match themselves. Any meta-character with special meaning may be quoted by preceding it with a backslash. A bracket expression is a list of characters enclosed by [ and ]. For example, the regular expression [] matches any single digit. Within a bracket expression, a range expression consists of two characters separated by a hyphen.

It matches any single character that sorts between the two characters, inclusive, using the locale's collating sequence and character set.

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For example, in the default C locale, [a-d] is equivalent to [abcd]. Many locales sort characters in dictionary order, and in these locales [a-d] is typically not equivalent to [abcd] ; it might be equivalent to [aBbCcDd] , for example. Finally, certain named classes of characters are predefined within bracket expressions, as follows. Their names are self explanatory, and they are [:alnum:] , [:alpha:] , [:cntrl:] , [:digit:] , [:graph:] , [:lower:] , [:print:] , [:punct:] , [:space:] , [:upper:] , and [:xdigit:].

For example, [[:alnum:]] means the character class of numbers and letters in the current locale. Note that the brackets in these class names are part of the symbolic names, and must be included in addition to the brackets delimiting the bracket expression. Most meta-characters lose their special meaning inside bracket expressions. To include a literal ] place it first in the list. Finally, to include a literal - , place it last. Two regular expressions may be concatenated ; the resulting regular expression matches any string formed by concatenating two substrings that respectively match the concatenated expressions.

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Two regular expressions may be joined by the infix operator ; the resulting regular expression matches any string matching either alternate expression. Repetition takes precedence over concatenation, which in turn takes precedence over alternation. A whole expression may be enclosed in parentheses to override these precedence rules and form a subexpression. In basic regular expressions the meta-characters? POSIX allows this behavior as an extension, but portable scripts should avoid it.

The first of these variables that is set specifies the locale. The C locale is used if none of these environment variables are set, if the locale catalog is not installed, or if grep was not compiled with national language support NLS. The exit status is 0 if selected lines are found, and 1 if not found. If an error occurred the exit status is 2. If you haven't already see our example usage section we suggest reviewing that section first.

By adding quotes around the string this allows you to place spaces in the grep search. Search the file myfile. Only lines containing the distinct word "hope" will be matched. Lines in which "hope" is part of a word will not be matched.

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Same as previous command, but displays a count of how many lines were matched, rather than the matching lines themselves. Inverse of previous command: displays a count of the lines in myfile.

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Tip If you haven't already see our example usage section we suggest reviewing that section first. Was this page useful? Print a help message briefly summarizing command-line options, and exit. Extended Regular Expressions. This is the default option when running grep. This functionality is still experimental, and may produce warning messages. This can be used to specify multiple search patterns, or to protect a pattern beginning with a dash -.

Select only those lines containing matches that form whole words. The test is that the matching substring must either be at the beginning of the line, or preceded by a non-word constituent character. Or, it must be either at the end of the line or followed by a non-word constituent character. Word-constituent characters are letters, digits, and underscores. Instead of the normal output, print a count of matching lines for each input file.


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With the -v , --invert-match option see below , count non-matching lines. Surround the matched non-empty strings, matching lines, context lines, file names, line numbers, byte offsets, and separators for fields and groups of context lines with escape sequences to display them in color on the terminal. WHEN is never , always , or auto. The county seat is Richmond, while its largest city is Sugar Land. The Fort Bend Central Appraisal District reserves the right to make changes at any time without notice. Original records may differ from the information on these pages.

Verification of information on source documents is recommended. Fort Bend Central Appraisal District.

If no args, returns the list of names in current local symbol table. With a module, class or class instance object as arg, returns list of names in its attr. Eval string s in optional globals , locals contexts. Constructs a list from those elements of sequence for which function returns true. Gets attribute called name from object ,e. If not found, raises AttributeError or returns default if specified. Converts a number or a string to a plain integer. Optional base paramenter specifies base from which to convert string values.

Enters aString in the table of "interned strings" and returns the string. Interned strings are 'immortals'. Converts sequence into a list. If already a list, returns a copy of it. Converts a number or a string to a long integer. Applies function to every item of list and returns a list of the results. If additional arguments are passed, function must take that many arguments and it is givent o function on each call.

Returns a new file object. Works with Unicode char. Returns x to power y [modulo z ]. With 1 arg, list from See also input.