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Doc: alphabetize the regexp_foo() function descriptions in 9.7.3.

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For no visible reason (other than historical accident no doubt),
regexp_replace() was out of order.  Re-order to match the way
that these functions are listed in 9.4.  (That means substring()
remains first, because it's SQL-standard and the rest aren't.)
I've not touched the text other than to move it.  This is just
to reduce confusion in the diffs for upcoming additions.
pull/68/head
Tom Lane 4 years ago
parent ef12f32c08
commit 64a1f22565
1 changed files with 43 additions and 43 deletions
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  1. 86
      doc/src/sgml/func.sgml

86
doc/src/sgml/func.sgml
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@ -5377,15 +5377,15 @@ substring('foobar' similar '#"o_b#"%' escape '#') <lineannotation>NULL</linea
<indexterm>
<primary>substring</primary>
</indexterm>
<indexterm>
<primary>regexp_replace</primary>
</indexterm>
<indexterm>
<primary>regexp_match</primary>
</indexterm>
<indexterm>
<primary>regexp_matches</primary>
</indexterm>
<indexterm>
<primary>regexp_replace</primary>
</indexterm>
<indexterm>
<primary>regexp_split_to_table</primary>
</indexterm>
@ -5542,46 +5542,6 @@ substring('foobar' from 'o(.)b') <lineannotation>o</lineannotation>
</programlisting>
</para>
<para>
The <function>regexp_replace</function> function provides substitution of
new text for substrings that match POSIX regular expression patterns.
It has the syntax
<function>regexp_replace</function>(<replaceable>source</replaceable>,
<replaceable>pattern</replaceable>, <replaceable>replacement</replaceable>
<optional>, <replaceable>flags</replaceable> </optional>).
The <replaceable>source</replaceable> string is returned unchanged if
there is no match to the <replaceable>pattern</replaceable>. If there is a
match, the <replaceable>source</replaceable> string is returned with the
<replaceable>replacement</replaceable> string substituted for the matching
substring. The <replaceable>replacement</replaceable> string can contain
<literal>\</literal><replaceable>n</replaceable>, where <replaceable>n</replaceable> is 1
through 9, to indicate that the source substring matching the
<replaceable>n</replaceable>'th parenthesized subexpression of the pattern should be
inserted, and it can contain <literal>\&amp;</literal> to indicate that the
substring matching the entire pattern should be inserted. Write
<literal>\\</literal> if you need to put a literal backslash in the replacement
text.
The <replaceable>flags</replaceable> parameter is an optional text
string containing zero or more single-letter flags that change the
function's behavior. Flag <literal>i</literal> specifies case-insensitive
matching, while flag <literal>g</literal> specifies replacement of each matching
substring rather than only the first one. Supported flags (though
not <literal>g</literal>) are
described in <xref linkend="posix-embedded-options-table"/>.
</para>
<para>
Some examples:
<programlisting>
regexp_replace('foobarbaz', 'b..', 'X')
<lineannotation>fooXbaz</lineannotation>
regexp_replace('foobarbaz', 'b..', 'X', 'g')
<lineannotation>fooXX</lineannotation>
regexp_replace('foobarbaz', 'b(..)', 'X\1Y', 'g')
<lineannotation>fooXarYXazY</lineannotation>
</programlisting>
</para>
<para>
The <function>regexp_match</function> function returns a text array of
captured substring(s) resulting from the first match of a POSIX
@ -5684,6 +5644,46 @@ SELECT col1, (SELECT regexp_matches(col2, '(bar)(beque)')) FROM tab;
</para>
</tip>
<para>
The <function>regexp_replace</function> function provides substitution of
new text for substrings that match POSIX regular expression patterns.
It has the syntax
<function>regexp_replace</function>(<replaceable>source</replaceable>,
<replaceable>pattern</replaceable>, <replaceable>replacement</replaceable>
<optional>, <replaceable>flags</replaceable> </optional>).
The <replaceable>source</replaceable> string is returned unchanged if
there is no match to the <replaceable>pattern</replaceable>. If there is a
match, the <replaceable>source</replaceable> string is returned with the
<replaceable>replacement</replaceable> string substituted for the matching
substring. The <replaceable>replacement</replaceable> string can contain
<literal>\</literal><replaceable>n</replaceable>, where <replaceable>n</replaceable> is 1
through 9, to indicate that the source substring matching the
<replaceable>n</replaceable>'th parenthesized subexpression of the pattern should be
inserted, and it can contain <literal>\&amp;</literal> to indicate that the
substring matching the entire pattern should be inserted. Write
<literal>\\</literal> if you need to put a literal backslash in the replacement
text.
The <replaceable>flags</replaceable> parameter is an optional text
string containing zero or more single-letter flags that change the
function's behavior. Flag <literal>i</literal> specifies case-insensitive
matching, while flag <literal>g</literal> specifies replacement of each matching
substring rather than only the first one. Supported flags (though
not <literal>g</literal>) are
described in <xref linkend="posix-embedded-options-table"/>.
</para>
<para>
Some examples:
<programlisting>
regexp_replace('foobarbaz', 'b..', 'X')
<lineannotation>fooXbaz</lineannotation>
regexp_replace('foobarbaz', 'b..', 'X', 'g')
<lineannotation>fooXX</lineannotation>
regexp_replace('foobarbaz', 'b(..)', 'X\1Y', 'g')
<lineannotation>fooXarYXazY</lineannotation>
</programlisting>
</para>
<para>
The <function>regexp_split_to_table</function> function splits a string using a POSIX
regular expression pattern as a delimiter. It has the syntax

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