[#bsl-basic_string-0faf-replace-041]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0faf.adoc[basic_string]::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 characters in the range starting at the specified `stringFirst` and ending right before the specified `stringLast` iterator, both of the (template parameter) type `INPUT_ITER`. Return a reference providing modifiable access to this string. The behavior is undefined unless `first` and `last` are both within the range `[cbegin() .. cend()]`, `first <= last`, and `stringFirst` and `stringLast` refer to a sequence of valid values where `stringFirst` is at a position at or before `stringLast`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITER>
xref:bsl/basic_string-0faf.adoc[basic_string]&
replace(
    xref:bsl/basic_string-0faf/const_iterator.adoc[const_iterator] first,
    xref:bsl/basic_string-0faf/const_iterator.adoc[const_iterator] last,
    INPUT_ITER stringFirst,
    INPUT_ITER stringLast);
----


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