[#bsl-basic_string-0fb-replace-0cc]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0fb.adoc[basic_string<char>]::replace
:relfileprefix: ../../
:mrdocs:

Replace the substring in the range starting at the specified `first` position and ending right before the specified `last` position with the specified null‐terminated `characterString` (of length `CHAR_TRAITS::length(characterString)`). Return a reference providing modifiable access to this string. The behavior is undefined unless `first` and `last` are both within the range `[cbegin() .. cend()]` and `first <= last`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0faf.adoc[basic_string<char>]&
replace(
    xref:bsl/basic_string-0fb/const_iterator.adoc[const_iterator] first,
    xref:bsl/basic_string-0fb/const_iterator.adoc[const_iterator] last,
    char const* characterString);
----


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