[#bsl-basic_string-0faf-replace-093]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0faf.adoc[basic_string]::replace
:relfileprefix: ../../
:mrdocs:

Replace a substring of this string.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
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,
    xref:bsl/basic_string-0faf/size_type.adoc[size_type] numChars,
    CHAR_TYPE character);
----

== Description

Replace the substring in the range starting at the specified `first` position and ending right before the specified `last` position with the specified `numChars` copies of the specified `character`. 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`.

== Return Value

reference providing modifiable access to this string

== Parameters

[cols="1,4"]
|===
| Name| Description
| *first*
| beginning of the range (inclusive)
| *last*
| end of the range (exclusive)
| *numChars*
| number of characters
| *character*
| character value
|===


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