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diff --git a/include/comphelper/string.hxx b/include/comphelper/string.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+#pragma once
+
+#include <sal/config.h>
+
+#include <algorithm>
+#include <vector>
+#include <comphelper/comphelperdllapi.h>
+#include <sal/types.h>
+#include <rtl/strbuf.hxx>
+#include <rtl/ustrbuf.hxx>
+#include <com/sun/star/uno/Sequence.h>
+#include <com/sun/star/uno/Reference.hxx>
+
+#include <com/sun/star/lang/Locale.hpp>
+
+namespace com::sun::star::i18n { class XBreakIterator; }
+namespace com::sun::star::i18n { class XCollator; }
+namespace com::sun::star::uno { class XComponentContext; }
+
+// OUString helper functions that are not widespread or mature enough to
+// go into the stable URE API:
+namespace comphelper::string {
+
+/** Removes all occurrences of a character from within the source string
+
+    @param rIn      The input OUStringBuffer
+    @param c        The character to be removed
+
+    @return         The resulting OUStringBuffer
+ */
+inline OUStringBuffer& remove(OUStringBuffer &rIn,
+    sal_Unicode c)
+{
+    sal_Int32 index = 0;
+    while (true)
+    {
+        if (index >= rIn.getLength())
+            break;
+        index = rIn.indexOf(c, index);
+        if (index == -1)
+            break;
+        rIn.remove(index, 1);
+    }
+    return rIn;
+}
+
+/** Strips occurrences of a character from the start of the source string
+
+    @param rIn      The input OString
+    @param c        The character to be stripped from the start
+
+    @return         The resulting OString
+ */
+COMPHELPER_DLLPUBLIC OString stripStart(const OString& rIn,
+    char c);
+COMPHELPER_DLLPUBLIC std::string_view stripStart(std::string_view rIn,
+    char c);
+
+/** Strips occurrences of a character from the start of the source string
+
+    @param rIn      The input OUString
+    @param c        The character to be stripped from the start
+
+    @return         The resulting OUString
+ */
+COMPHELPER_DLLPUBLIC OUString stripStart(const OUString& rIn,
+    sal_Unicode c);
+COMPHELPER_DLLPUBLIC std::u16string_view stripStart(std::u16string_view rIn,
+    sal_Unicode c);
+
+/** Strips occurrences of a character from the end of the source string
+
+    @param rIn      The input OString
+    @param c        The character to be stripped from the end
+
+    @return         The resulting OString
+ */
+COMPHELPER_DLLPUBLIC OString stripEnd(const OString& rIn,
+    char c);
+COMPHELPER_DLLPUBLIC std::string_view stripEnd(std::string_view rIn,
+    char c);
+
+/** Strips occurrences of a character from the end of the source string
+
+    @param rIn      The input OUString
+    @param c        The character to be stripped from the end
+
+    @return         The resulting OUString
+ */
+COMPHELPER_DLLPUBLIC OUString stripEnd(const OUString& rIn,
+    sal_Unicode c);
+COMPHELPER_DLLPUBLIC std::u16string_view stripEnd(std::u16string_view rIn,
+    sal_Unicode c);
+
+/** Strips occurrences of a character from the start and end of the source string
+
+    @param rIn      The input OString
+    @param c        The character to be stripped from the start and end
+
+    @return         The resulting OString
+ */
+COMPHELPER_DLLPUBLIC OString strip(const OString& rIn,
+    char c);
+COMPHELPER_DLLPUBLIC std::string_view strip(std::string_view rIn,
+    char c);
+
+/** Strips occurrences of a character from the start and end of the source string
+
+    @param rIn      The input OUString
+    @param c        The character to be stripped from the start and end
+
+    @return         The resulting OUString
+ */
+COMPHELPER_DLLPUBLIC OUString strip(const OUString& rIn,
+    sal_Unicode c);
+COMPHELPER_DLLPUBLIC std::u16string_view strip(std::u16string_view rIn,
+    sal_Unicode c);
+
+/** Returns number of tokens in an OUString
+
+  @param    rIn     the input OString
+  @param    cTok    the character which separate the tokens.
+  @return   the number of tokens
+*/
+COMPHELPER_DLLPUBLIC sal_Int32 getTokenCount(std::string_view rIn, char cTok);
+
+/** Returns number of tokens in an OUString
+
+  @param    rIn     the input OUString
+  @param    cTok    the character which separate the tokens.
+  @return   the number of tokens
+*/
+COMPHELPER_DLLPUBLIC sal_Int32 getTokenCount(std::u16string_view rIn, sal_Unicode cTok);
+
+/** Reverse an OUString's UTF-16 code units.
+
+  @param    rIn     the input OUString
+  @return   the reversed input
+*/
+COMPHELPER_DLLPUBLIC OUString reverseString(std::u16string_view rStr);
+
+/** Reverse an OString
+
+  @param    rIn     the input OString
+  @return   the reversed input
+*/
+COMPHELPER_DLLPUBLIC OString reverseString(std::string_view rStr);
+
+/** Reverse an OUString's Unicode code points.
+*/
+COMPHELPER_DLLPUBLIC OUString reverseCodePoints(OUString const & str);
+
+namespace detail
+{
+    template<typename B> B& truncateToLength(B& rBuffer, sal_Int32 nLen)
+    {
+        if (nLen < rBuffer.getLength())
+            rBuffer.setLength(nLen);
+        return rBuffer;
+    }
+}
+
+/** Truncate a buffer to a given length.
+
+    If the StringBuffer has more characters than nLength it will be truncated
+    on the right to nLength characters.
+
+    Has no effect if the StringBuffer is <= nLength
+
+    @param rBuf   StringBuffer to operate on
+    @param nLength   Length to truncate the buffer to
+
+    @return         rBuf;
+ */
+inline OUStringBuffer& truncateToLength(
+    OUStringBuffer& rBuffer, sal_Int32 nLength)
+{
+    return detail::truncateToLength(rBuffer, nLength);
+}
+
+namespace detail
+{
+    template<typename B, typename U> B& padToLength(B& rBuffer, sal_Int32 nLen, U cFill)
+    {
+        const sal_Int32 nPadLen = nLen - rBuffer.getLength();
+        if (nPadLen > 0)
+            std::fill_n(rBuffer.appendUninitialized(nPadLen), nPadLen, cFill);
+        return rBuffer;
+    }
+}
+
+/** Pad a buffer to a given length using a given char.
+
+    If the StringBuffer has less characters than nLength it will be expanded on
+    the right to nLength characters, with the expansion filled using cFill.
+
+    Has no effect if the StringBuffer is >= nLength
+
+    @param rBuf   StringBuffer to operate on
+    @param nLength   Length to pad the buffer to
+    @param cFill  character to fill expansion with
+
+    @return         rBuf;
+ */
+inline OStringBuffer& padToLength(
+    OStringBuffer& rBuffer, sal_Int32 nLength,
+    char cFill = '\0')
+{
+    return detail::padToLength(rBuffer, nLength, cFill);
+}
+
+inline OUStringBuffer& padToLength(
+    OUStringBuffer& rBuffer, sal_Int32 nLength,
+    sal_Unicode cFill = '\0')
+{
+    return detail::padToLength(rBuffer, nLength, cFill);
+}
+
+/** Similar to OUString::replaceAt, but for an OUStringBuffer.
+
+    Replace n = count characters
+    from position index in this string with newStr.
+ */
+COMPHELPER_DLLPUBLIC void replaceAt(OUStringBuffer& rIn, sal_Int32 index, sal_Int32 count, std::u16string_view newStr );
+
+/** Replace a token in a string
+    @param rIn       OUString in which the token is to be replaced
+    @param nToken    which nToken to replace
+    @param cTok      token delimiter
+    @param rNewToken replacement token
+
+    @return original string with token nToken replaced by rNewToken
+ */
+COMPHELPER_DLLPUBLIC OUString setToken(const OUString& rIn, sal_Int32 nToken, sal_Unicode cTok,
+    std::u16string_view rNewToken);
+
+/** Find any of a list of code units in the string.
+    @param rIn      OUString to search
+    @param pChars   0-terminated array of sal_Unicode code units to search for
+    @param nPos     start position
+
+    @return position of first occurrence of any of the elements of pChars
+            or -1 if none of the code units occur in the string
+ */
+COMPHELPER_DLLPUBLIC sal_Int32 indexOfAny(std::u16string_view rIn,
+        sal_Unicode const*const pChars, sal_Int32 const nPos);
+
+/** Remove any of a list of code units in the string.
+    @param rIn      OUString to search
+    @param pChars   0-terminated array of sal_Unicode code units to search for
+
+    @return OUString that has all of the pChars code units removed
+ */
+COMPHELPER_DLLPUBLIC OUString removeAny(std::u16string_view rIn,
+        sal_Unicode const*const pChars);
+
+/** Convert a sequence of strings to a single comma separated string.
+
+    Note that no escaping of commas or anything fancy is done.
+
+    @param i_rSeq   A list of strings to be concatenated.
+
+    @return         A single string containing the concatenation of the given
+                    list, interspersed with the string ", ".
+ */
+COMPHELPER_DLLPUBLIC OUString convertCommaSeparated(
+    css::uno::Sequence< OUString > const & i_rSeq);
+
+/// Return a string which is the concatenation of the strings in the sequence.
+COMPHELPER_DLLPUBLIC OString join(std::string_view rSeparator, const std::vector<OString>& rSequence);
+
+/** Convert a decimal string to a number.
+
+    The string must be base-10, no sign but can contain any
+    codepoint listed in the "Number, Decimal Digit" Unicode
+    category.
+
+    No verification is made about the validity of the string,
+    passing string not containing decimal digit code points
+    gives unspecified results
+
+    If your string is guaranteed to contain only ASCII digit
+    use OUString::toInt32 instead.
+
+    @param str  The string to convert containing only decimal
+                digit codepoints.
+
+    @return     The value of the string as an int32.
+ */
+COMPHELPER_DLLPUBLIC sal_uInt32 decimalStringToNumber(
+    OUString const & str );
+
+COMPHELPER_DLLPUBLIC std::vector<OUString>
+    split(std::u16string_view rString, const sal_Unicode cSeparator);
+
+/** Convert a single comma separated string to a sequence of strings.
+
+    Note that no escaping of commas or anything fancy is done.
+
+    @param i_rString    A string containing comma-separated words.
+
+    @return         A sequence of strings resulting from splitting the given
+                    string at ',' tokens and stripping whitespace.
+ */
+COMPHELPER_DLLPUBLIC css::uno::Sequence< OUString >
+    convertCommaSeparated( std::u16string_view i_rString );
+
+/**
+  Compares two strings using natural order.
+
+  For non digit characters, the comparison use the same algorithm as
+  rtl_str_compare. When a number is encountered during the comparison,
+  natural order is used. Thus, Heading 10 will be considered as greater
+  than Heading 2. Numerical comparison is done using decimal representation.
+
+  Beware that "MyString 001" and "MyString 1" will be considered as equal
+  since leading 0 are meaningless.
+
+  @param    str         the object to be compared.
+  @return   0 - if both strings are equal
+            < 0 - if this string is less than the string argument
+            > 0 - if this string is greater than the string argument
+*/
+COMPHELPER_DLLPUBLIC sal_Int32 compareNatural( const OUString &rLHS, const OUString &rRHS,
+    const css::uno::Reference< css::i18n::XCollator > &rCollator,
+    const css::uno::Reference< css::i18n::XBreakIterator > &rBI,
+    const css::lang::Locale &rLocale );
+
+class COMPHELPER_DLLPUBLIC NaturalStringSorter
+{
+private:
+    css::lang::Locale const                          m_aLocale;
+    css::uno::Reference< css::i18n::XCollator >      m_xCollator;
+    css::uno::Reference< css::i18n::XBreakIterator > m_xBI;
+public:
+    NaturalStringSorter(
+        const css::uno::Reference< css::uno::XComponentContext > &rContext,
+        css::lang::Locale aLocale);
+    sal_Int32 compare(const OUString &rLHS, const OUString &rRHS) const
+    {
+        return compareNatural(rLHS, rRHS, m_xCollator, m_xBI, m_aLocale);
+    }
+    const css::lang::Locale& getLocale() const { return m_aLocale; }
+};
+
+/** Determine if an OString contains solely ASCII numeric digits
+
+    @param rString  An OString
+
+    @return         false if string contains any characters outside
+                    the ASCII '0'-'9' range
+                    true otherwise, including for empty string
+ */
+COMPHELPER_DLLPUBLIC bool isdigitAsciiString(std::string_view rString);
+
+/** Determine if an OUString contains solely ASCII numeric digits
+
+    @param rString  An OUString
+
+    @return         false if string contains any characters outside
+                    the ASCII '0'-'9' range
+                    true otherwise, including for empty string
+ */
+COMPHELPER_DLLPUBLIC bool isdigitAsciiString(std::u16string_view rString);
+
+} // namespace comphelper::string
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */