The pattern \d+ means any number of numeric digits. \d{2,3} means a two- or three-digit number. Table 4-1. Regular expression metacharacter syntax Subexpression Matches Notes General \^ Start of line/string $ End of line/string \b Word boundary \B Not a word boundary \A Beginning ...
for the match expression (in the first column in PFrank), which should match any number of digits, optionally followed by a hyphen and an additional optional whitespace character between the two. You would then have no replacement expression (zero-length string or an empty second column in PF...
When used as the first character in a bracket expression, ^ negates the character set. ^\d{3} matches 3 numeric digits at the start of the searched string. [^abc] matches any character except a, b, and c. $ Matches the position at the end of the searched string. If the Multiline...
Any numeric digit; equivalent to [0-9] '\d*' matches any number of consecutive digits. \D Any nondigit character; equivalent to [^0-9] '\w*\D\>' matches words that do not end with a numeric digit. \oN or \o{N} Character of octal value N '\o{40}' matches the space charact...
When used as the first character in a bracket expression, ^ negates the character set. ^\d{3} matches 3 numeric digits at the start of the searched string. [^abc] matches any character except a, b, and c. $ Matches the position at the end of the searched string. If the m (multi...
\numberBackreference. Matches the value of a numbered subexpression.(\w)\1"ee"in"seek" \k<name>Named backreference. Matches the value of a named expression.(?<char>\w)\k<char>"ee"in"seek" Alternation Constructs Alternation constructs modify a regular expression to enable either/or matching....
a concatenated regular expression can be followed by the character '|' and another concatenated regular expression. Any number of concatenated regular expressions can be combined in this manner. The resulting expression matches any target sequence that matches one or more of the concatenated regular ex...
egrep interprets the first command-line argument as a regular expression, and any remaining arguments as the file(s) to search. Note, however, that the single quotes shown in Figure 1-1 are not part of the regular expression, but are needed by my command shell.† When using egrep, I...
followed by any number of digits, possibly none. Again, to exclude things like "1,111.", change (.\d*) to (.\d+). Trailing zeros can be handled as in 4. or 5. F does not overlap A,B,C,D, or E. I couldn't think of an easier regexp for F. Let me know if you are ...
*literal *, for any punctuation character * \123octal character code (up to three digits) \x7Fhex character code (exactly two digits) \x{10FFFF}hex character code \Cmatch a single byte even in UTF-8 mode \Q...\Eliteral text ... even if ... has punctuation ...