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Commit172e6b3

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Support RN (roman-numeral format) in to_number().
We've long had roman-numeral output support in to_char(),but lacked the reverse conversion. Here it is.Author: Hunaid Sohail <hunaidpgml@gmail.com>Reviewed-by: Maciek Sakrejda <m.sakrejda@gmail.com>Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>Reviewed-by: Tomas Vondra <tomas@vondra.me>Discussion:https://postgr.es/m/CAMWA6ybh4M1VQqpmnu2tfSwO+3gAPeA8YKnMHVADeB=XDEvT_A@mail.gmail.com
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‎doc/src/sgml/func.sgml

Lines changed: 15 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8669,8 +8669,8 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
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<entry>plus/minus sign in specified position</entry>
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</row>
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<row>
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<entry><literal>RN</literal></entry>
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<entry>Roman numeral (input between 1 and 3999)</entry>
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<entry><literal>RN</literal> or <literal>rn</literal></entry>
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<entry>Roman numeral (values between 1 and 3999)</entry>
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</row>
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<row>
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<entry><literal>TH</literal> or <literal>th</literal></entry>
@@ -8798,6 +8798,19 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
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(e.g., <literal>9.99EEEE</literal> is a valid pattern).
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</para>
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</listitem>
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<listitem>
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<para>
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In <function>to_number()</function>, the <literal>RN</literal>
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pattern converts Roman numerals (in standard form) to numbers.
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Input is case-insensitive, so <literal>RN</literal>
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and <literal>rn</literal> are equivalent. <literal>RN</literal>
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cannot be used in combination with any other formatting patterns or
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modifiers except <literal>FM</literal>, which is applicable only
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in <function>to_char()</function> and is ignored
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in <function>to_number()</function>.
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</para>
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</listitem>
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</itemizedlist>
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</para>
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