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Diffstat (limited to 'txr.1')
| -rw-r--r-- | txr.1 | 32 |
1 files changed, 32 insertions, 0 deletions
@@ -368,6 +368,27 @@ Control characters may be embedded directly in a query (with the exception of newline characters). An alternative to embedding is to use escape syntax. The following escapes are supported: +.IP @\e<newline> +A backslash immediately followed by a newline introduces a physical line +break without breaking up the logical line. Material following this sequence +continues to be interpreted as a continuation of the previous line, so +that indentation can be introduced to show the continuation without appearing +in the data. +.IP @\e<space> +A backslash followed by a space encodes a space. This is useful in line +continuations when it is necessary for leading spaces to be preserved. +For instance the two line sequence + + abcd@\ + @\ efg + +is equivalent to the line + + abcd efg + +The two spaces before the @\ in the second line are consumed. The +spaces after are preserved. + .IP @\ea Alert character (ASCII 7, BEL). .IP @\eb @@ -445,6 +466,17 @@ directive may be used, which has the following syntax: where the RE part enclosed in slashes represents regular expression syntax (described in the section Regular Expressions below). +Long regular expressions can be broken into multiple lines using a +backslash-newline sequence. Whitespace before the sequence or after the +sequence is not significant, so the following two are equivalent: + + @/reg \e + ular/ + + @/regular/ + +There may not be whitespace between the backslash and newline. + Whereas literal text simply represents itself, regular expression denotes a (potentially infinite) set of texts. The regular expression directive matches the longest piece of text (possibly empty) which belongs to the set |