The backslash in a regular expression precedes a literal character. You also escape certain letters that represent common character classes, such as \w for a word character or \s for a space. The following example matches word characters (alphanumeric and underscores) and spaces.
Regex(
"Are you there, Alice?, asked Jerry.", // source
"(here|there).+(\w+).+(said|asked)(\s)(\w+)\." ); // regular expression
"there, Alice?, asked Jerry."
|
(here|there).+ |
Matches “there”, a comma, and a space. |
|
(\w+) |
Matches “Alice”. |
|
.+ |
Matches “?, “. |
|
(said|asked)(\s) |
Matches “asked” followed by a space. Without the space, the match would end here; “asked” is followed by a space in the source string. |
|
(\w+)\. |
Matches “Jerry” and a period. |
表 6.10 describes the escaped characters supported in JMP. \C, \G, \X, and \z are not supported.
|
\\ |
single backslash |
|
\A |
start of a string |
|
\b |
word boundary. The zero-length string between \w and \W or \W and \w. |
|
\B |
not at a word boundary |
|
\cX |
ASCII control character |
|
\d |
single digit [0-9] |
|
\D |
single character that is NOT a digit [^0-9] |
|
\E |
stop processing escaped characters |
|
\l |
match a single lowercase letter [a-z] |
|
\L |
single character that is not lowercase [^a-z] |
|
\Q |
ignore escaped characters until \E is found |
|
\r |
carriage return |
|
\s |
single whitespace character |
|
\S |
single character that is NOT white space |
|
\u |
single uppercase character [A-Z] |
|
\U |
single character that is not uppercase [^A-Z] |
|
\w |
word character [a-zA-Z0-9_] |
|
\W |
single character that is NOT a word character [^a-zA-Z0-9_] |
|
\x00-\xFF |
hexadecimal character |
|
\x{0000}-\x{FFFF} |
Unicode code point |
|
\Z |
end of a string before the line break |