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frontpage web hosting {n,} The preceding item is matched n or more times. {n,m} The preceding item is matched at least n times, but not more than m times. Two regular expressions may be concatenated; the resulting regular expression matches any string formed by concate- nating two substrings that respectively match the concate- nated subexpressions. Two regular expressions may be joined by the infix opera- tor |; the resulting regular expression matches any string matching either subexpression. Repetition takes precedence over concatenation, which in turn takes precedence over alternation.
frontpage web hosting A whole subex- pression may be enclosed in parentheses to override these precedence rules. The backreference \n, where n is a single digit, matches the substring previously matched by the nth parenthesized subexpression of the regular expression. In basic regular expressions the metacharacters ?, +, {, |, (, and ) lose their special meaning; instead use the backslashed versions \?, \+, \{, \|, \(, and \). Traditional egrep did not support the { metacharacter, and some egrep implementations support \{ instead, so portable scripts should avoid { in egrep patterns and should use [{] to match a literal {. GNU egrep attempts to support traditional usage by assum- ing that { is not special if it would be the start of an invalid interval specification.
frontpage web hosting For example, the shell command egrep '{1' searches for the two-character string {1 instead of reporting a syntax error in the regular expression. POSIX.2 allows this behavior as an extension, but portable scripts should avoid it. ENVIRONMENT VARIABLES Grep's behavior is affected by the following environment variables. A locale LC_foo is specified by examining the three envi- ronment variables LC_ALL, LC_foo, LANG, in that order.
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