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authorru <ru@FreeBSD.org>2002-12-18 12:45:11 +0000
committerru <ru@FreeBSD.org>2002-12-18 12:45:11 +0000
commit8746d263e1451855025dc83dde5176cc9f1fbe3f (patch)
treeee7f7ba4650cadf44410ca9a44676c72c96739b7 /lib/libc/regex
parent160081aef68b0dc49b79d3b7702b75671d9c06ff (diff)
downloadFreeBSD-src-8746d263e1451855025dc83dde5176cc9f1fbe3f.zip
FreeBSD-src-8746d263e1451855025dc83dde5176cc9f1fbe3f.tar.gz
mdoc(7) police: "The .Fn function".
Diffstat (limited to 'lib/libc/regex')
-rw-r--r--lib/libc/regex/regex.341
1 files changed, 31 insertions, 10 deletions
diff --git a/lib/libc/regex/regex.3 b/lib/libc/regex/regex.3
index dc0bac8..22e8447 100644
--- a/lib/libc/regex/regex.3
+++ b/lib/libc/regex/regex.3
@@ -72,7 +72,9 @@ regular expressions
.Pq Do RE Dc Ns s ;
see
.Xr re_format 7 .
-.Fn Regcomp
+The
+.Fn regcomp
+function
compiles an RE written as a string into an internal form,
.Fn regexec
matches that internal form against a string and reports results,
@@ -96,7 +98,9 @@ a type
and a number of constants with names starting with
.Dq Dv REG_ .
.Pp
-.Fn Regcomp
+The
+.Fn regcomp
+function
compiles the regular expression contained in the
.Fa pattern
string,
@@ -204,7 +208,9 @@ fails, it returns a non-zero error code;
see
.Sx DIAGNOSTICS .
.Pp
-.Fn Regexec
+The
+.Fn regexec
+function
matches the compiled RE pointed to by
.Fa preg
against the
@@ -390,7 +396,9 @@ the value of
will not be changed by a successful
.Fn regexec .
.Pp
-.Fn Regerror
+The
+.Fn regerror
+function
maps a non-zero
.Fa errcode
from either
@@ -413,11 +421,14 @@ it should have been the result from the most recent
.Fn regcomp
using that
.Ft regex_t .
-.No ( Fn Regerror
+The
+.Fn ( regerror
may be able to supply a more detailed message using information
from the
.Ft regex_t . )
-.Fn Regerror
+The
+.Fn regerror
+function
places the NUL-terminated message into the buffer pointed to by
.Fa errbuf ,
limiting the length (including the NUL) to at most
@@ -474,7 +485,9 @@ and should be used with
caution in software intended to be portable to other systems.
Be warned also that they are considered experimental and changes are possible.
.Pp
-.Fn Regfree
+The
+.Fn regfree
+function
frees any dynamically-allocated storage associated with the compiled RE
pointed to by
.Fa preg .
@@ -590,7 +603,9 @@ include the following:
.Pp
.Bl -tag -width REG_ECOLLATE -compact
.It Dv REG_NOMATCH
+The
.Fn regexec
+function
failed to match
.It Dv REG_BADPAT
invalid regular expression
@@ -649,14 +664,18 @@ Please report problems.
The back-reference code is subtle and doubts linger about its correctness
in complex cases.
.Pp
-.Fn Regexec
+The
+.Fn regexec
+function
performance is poor.
This will improve with later releases.
.Fa Nmatch
exceeding 0 is expensive;
.Fa nmatch
exceeding 1 is worse.
-.Fn Regexec
+The
+.Fn regexec
+function
is largely insensitive to RE complexity
.Em except
that back
@@ -665,7 +684,9 @@ RE length does matter; in particular, there is a strong speed bonus
for keeping RE length under about 30 characters,
with most special characters counting roughly double.
.Pp
-.Fn Regcomp
+The
+.Fn regcomp
+function
implements bounded repetitions by macro expansion,
which is costly in time and space if counts are large
or bounded repetitions are nested.
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