diff options
Diffstat (limited to 'doc/re_syntax.n')
| -rw-r--r-- | doc/re_syntax.n | 44 |
1 files changed, 25 insertions, 19 deletions
diff --git a/doc/re_syntax.n b/doc/re_syntax.n index a74746a..46a180d 100644 --- a/doc/re_syntax.n +++ b/doc/re_syntax.n @@ -5,8 +5,10 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -.TH re_syntax n "8.1" Tcl "Tcl Built-In Commands" .so man.macros +.ie '\w'o''\w'\C'^o''' .ds qo \C'^o' +.el .ds qo u +.TH re_syntax n "8.1" Tcl "Tcl Built-In Commands" .BS .SH NAME re_syntax \- Syntax of Tcl regular expressions @@ -176,7 +178,7 @@ endpoint, so e.g. .QW \fBa\-c\-e\fR is illegal. Ranges in Tcl always use the Unicode collating sequence, but other programs may use other collating -sequences and this can be a source of incompatability between programs. +sequences and this can be a source of incompatibility between programs. .PP To include a literal \fB]\fR or \fB\-\fR in the list, the simplest method is to enclose it in \fB[.\fR and \fB.]\fR to make it a @@ -221,7 +223,8 @@ A character producing white space in displayed text. .IP \fBpunct\fR 8 A punctuation character. .IP \fBgraph\fR 8 -A character with a visible representation (includes both alnum and punct). +A character with a visible representation (includes both \fBalnum\fR +and \fBpunct\fR). .IP \fBcntrl\fR 8 A control character. .PP @@ -290,12 +293,12 @@ treatment is as if the enclosing delimiters were .QW \fB[.\fR \& and .QW \fB.]\fR .) -For example, if \fBo\fR and \fB\N'244'\fR are the members of an +For example, if \fBo\fR and \fB\*(qo\fR are the members of an equivalence class, then .QW \fB[[=o=]]\fR , -.QW \fB[[=\N'244'=]]\fR , +.QW \fB[[=\*(qo=]]\fR , and -.QW \fB[o\N'244']\fR \& +.QW \fB[o\*(qo]\fR \& are all synonymous. An equivalence class may not be an endpoint of a range. .RS .PP @@ -359,39 +362,42 @@ horizontal tab, as in C .TP \fB\eu\fIwxyz\fR . -(where \fIwxyz\fR is exactly four hexadecimal digits) the Unicode +(where \fIwxyz\fR is one up to four hexadecimal digits) the Unicode character \fBU+\fIwxyz\fR in the local byte ordering .TP \fB\eU\fIstuvwxyz\fR . -(where \fIstuvwxyz\fR is exactly eight hexadecimal digits) reserved -for a somewhat-hypothetical Unicode extension to 32 bits +(where \fIstuvwxyz\fR is one up to eight hexadecimal digits) reserved +for a Unicode extension up to 21 bits. The digits are parsed until the +first non-hexadecimal character is encountered, the maximun of eight +hexadecimal digits are reached, or an overflow would occur in the maximum +value of \fBU+\fI10ffff\fR. .TP \fB\ev\fR . vertical tab, as in C are all available. .TP -\fB\ex\fIhhh\fR +\fB\ex\fIhh\fR . -(where \fIhhh\fR is any sequence of hexadecimal digits) the character -whose hexadecimal value is \fB0x\fIhhh\fR (a single character no -matter how many hexadecimal digits are used). +(where \fIhh\fR is one or two hexadecimal digits) the character +whose hexadecimal value is \fB0x\fIhh\fR. .TP \fB\e0\fR . the character whose value is \fB0\fR .TP +\fB\e\fIxyz\fR +. +(where \fIxyz\fR is exactly three octal digits, and is not a \fIback +reference\fR (see below)) the character whose octal value is +\fB0\fIxyz\fR. The first digit must be in the range 0-3, otherwise +the two-digit form is assumed. +.TP \fB\e\fIxy\fR . (where \fIxy\fR is exactly two octal digits, and is not a \fIback reference\fR (see below)) the character whose octal value is \fB0\fIxy\fR -.TP -\fB\e\fIxyz\fR -. -(where \fIxyz\fR is exactly three octal digits, and is not a back -reference (see below)) the character whose octal value is -\fB0\fIxyz\fR .RE .PP Hexadecimal digits are |