diff options
Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 23 |
1 files changed, 18 insertions, 5 deletions
@@ -2052,14 +2052,13 @@ and the set matched by This operator is called intersection, logical and, or conjunction. .PP -Any escaped character which does not fall into the above escaping conventions, -or any unescaped character which is not a regular expression operator, denotes -one-position match of that character itself. +Any character which is not a regular expression operator, a backslash escape, +or the slash delimiter, denotes one-position match of that character itself. Any of the special characters, including the delimiting .codn / , -can be escaped with a backslash to suppress its meaning and denote the -character itself. +and the backslash, can be escaped with a backslash to suppress its +meaning and denote the character itself. Furthermore, all of the same escapes as are described in the section Special Characters in Text above are supported - the difference is that in regular @@ -2072,6 +2071,12 @@ rather than Octal and hex character escapes can be optionally terminated by a semicolon, which is useful if the following characters are octal or hex digits not intended to be part of the escape. + +Only the above escapes are supported. Unlike in some other regular expression +implementations, if a backlash appears before a character which isn't a regex +special character or one of the supported escape sequences, it is an error. +This wasn't true of historic versions of \*(TX. See the Compatibility section. + .IP "Precedence table, highest to lowest:" .TS tab(!); @@ -27924,6 +27929,14 @@ function automatically marks a stream open on a TTY devices as a real-time strea .code isatty function). +Also allows unrecognized backslash escape sequences in regular +expression syntax to simply denote the escaped character literally, +as was historically the case prior to \*(TX 106, so that +.code \ez +for instance denotes +.codn z . +As of \*(TX 106, these are diagnosed as errors. + .IP 102 Up to \*(TX 102, the .code get-string |