/usr/share/gtksourceview-3.0/language-specs/csv.lang is in libgtksourceview-3.0-common 3.18.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
This file is part of GtkSourceView
Author: Martin Blanchard <tchaik@gmx.com>
Copyright (C) 2015 Martin Blanchard <tchaik@gmx.com>
GtkSourceView is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
GtkSourceView is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-->
<language id="csv" _name="CSV" version="2.0" _section="Other">
<metadata>
<property name="mimetypes">text/csv</property>
<property name="globs">*.csv</property>
</metadata>
<styles>
<style id="decimal" _name="Decimal number" map-to="def:decimal"/>
<style id="escaped-character" _name="Escaped character" map-to="def:special-char"/>
<style id="floating-point" _name="Floating point number" map-to="def:floating-point"/>
<style id="string" _name="String" map-to="def:string"/>
</styles>
<definitions>
<context id="decimal" style-ref="decimal">
<match extended="true">
(?<![\w\.])
[0-9]+
(?![\w\.])
</match>
</context>
<context id="floating-point" style-ref="floating-point">
<match extended="true">
(?<![\w\.])
((\.[0-9]+ | [0-9]+\.[0-9]*) ([Ee][+-]?[0-9]*)? | ([0-9]+[Ee][+-]?[0-9]*))
(?![\w\.])
</match>
</context>
<context id="string" style-ref="string" class="string" class-disabled="no-spell-check">
<start>"</start>
<end>"</end>
<include>
<context id="escaped-character" style-ref="escaped-character">
<match extended="true">
\"\" # escaped double-quote
</match>
</context>
</include>
</context>
<context id="csv" class="no-spell-check">
<include>
<context ref="decimal"/>
<context ref="floating-point"/>
<context ref="string"/>
</include>
</context>
</definitions>
</language>
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