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Create / delete
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Create string
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a = "";
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a = "abcdef";
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abcdef
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Initialise
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Fixed contents
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a = "";
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a = "abcdef";
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abcdef
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Count
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Length of string
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a="abc";
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i=a.length();
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3
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Size of underlying storage
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a="abc";
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i=a.size();
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3
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Number of 'X' chars in string
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a="abcXdefXX";
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n=count(a .begin(),a.end(),'X');
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3
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Number of 'X', 'Y' and 'Z' chars in string
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a="abcXdefYZ";
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fn_xyz test ; n = count_if(a .begin(),a.end(),test);
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3
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Retrieve by index
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Retrieve 1st char
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a="abc";
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c=a[0];
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a
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Retrieve 1st char
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a="abc";
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c=*(a.begin());
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a
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Retrieve last char
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a="abc";
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c=a[a.length()-1];
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c
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Retrieve last char
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a="abc";
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c=*(a.end()-1);
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c
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Retrieve char 'n'
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a="abcdef";
n=2;
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c=a[n];
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c
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Slice
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Slice from index 'm' to 'n' (inclusive)
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a="abcdefghi";
m=3;
n=6;
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s=a.substr(m,n-m+1);
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defg
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Slice from index 'n' (inclusive)
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a="abcdefghi";
n=3;
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s=a.substr(n);
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defghi
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Slice up to index 'n' (inclusive)
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a="abcdefghi";
n=3;
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s=a.substr(0,n+1);
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abcd
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Compare
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Test for equality (case sensitive)
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a="abcdef";
b="abc";
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t=(a==b);
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0
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Test for prefix
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a="abcdef";
b="abc";
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t=(a .compare(0 ,b.length(),b)==0);
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1
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Test for suffix
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a="abcdef";
b="def";
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t=(a .compare(a .length()-b .length() ,b.length(),b)==0);
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1
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Search
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Test char 'is in' string
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a="abcdefghi";
c='c';
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t=(a .find(c)!=string::npos);
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1
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Test substring 'is in' string
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a="abcdefghi";
b="abc";
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t=(a .find(b)!=string::npos);
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1
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Find index of char (forward)
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a="abcdefccccc";
c='c';
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i=a.find(c);
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2
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Find index of char (reverse)
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a="abcdefccccc";
c='c';
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i=a.rfind(c);
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10
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Find index of substring (forward)
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a="abcdefabc";
b="abc";
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i=a.find(b);
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0
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Find index of substring (reverse)
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a="abcdefabc";
b="abc";
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i=a.rfind(b);
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6
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Split
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Split on char
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a="one,two,three";
c=',';
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sa .clear() ; while (a .length()) { sa .push_back(a .substr(0 , a .find_first_of(c))) ; a .erase(0 ,a .find_first_of(c)) ; a .erase(0 ,a.find_first_not_of(c)); }
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one two three
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|
Split on string
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a="aa_x_bb_x_cc";
b="_x_";
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sa .clear() ; while (a .length()) { sa .push_back(a .substr(0 , a .find_first_of(b))) ; a .erase(0 ,a .find_first_of(b)) ; a .erase(0 ,a.find_first_not_of(b)); }
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aa bb cc
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Insert
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Prepend char
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a="bcdef";
c='a';
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a=c+a;
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abcdef
|
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Prepend char
|
a="bcdef";
c='a';
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a.insert(a.begin(),c);
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abcdef
|
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Append char
|
a="abc";
c='d';
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a+=c;
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abcd
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Append char
|
a="abc";
c='d';
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a.insert(a.end(),c);
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abcd
|
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Insert char at index 'n'
|
a="abc";
c='X';
n=1;
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a.insert(a.begin()+n,c);
|
aXbc
|
|
Prepend string
|
a="def";
b="abc";
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a=b+a;
|
abcdef
|
|
Prepend string
|
a="def";
b="abc";
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a.insert(0,b);
|
abcdef
|
|
Append string
|
a="abc";
b="def";
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a+=b;
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abcdef
|
|
Append string
|
a="abc";
b="def";
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a.insert(a.length(),b);
|
abcdef
|
|
Insert string at index 'n'
|
a="abcghi";
b="def";
n=3;
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a.insert(n,b);
|
abcdefghi
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Concatenate 'a' and 'b'
|
a="abc";
b="def";
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s=a+b;
|
abcdef
|
Overwrite
|
Overwrite char at index 'n'
|
a="abc";
n=1;
c='B';
|
a[n]=c;
|
aBc
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|
Overwrite substring at index 'n'
|
a="abcdefghi";
b="DEF";
n=3;
|
a .replace(n ,b.length(),b);
|
abcDEFghi
|
Replace
|
Replace 1st instance of char 'X' with 'Y'
|
a="XXXYYYZZZ";
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if ((i=a .find('X'))!=string::npos) a[i]='Y' ;
|
YXXYYYZZZ
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|
Replace all instances of char 'X' with 'Y'
|
a="XXXYYYZZZ";
|
replace(a .begin() ,a.end(),'X','Y');
|
YYYYYYZZZ
|
|
Replace 1st instance of substring 'abc' with 'XYZ'
|
a="abcdefabc";
|
if ((i=a .find("abc"))!=string::npos) a .replace(i ,strlen("abc") ,"XYZ") ;
|
XYZdefabc
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|
Replace all instances of substring 'abc' with 'XYZ'
|
a="abcdefabc";
|
while ((i=a .find("abc"))!=string::npos) a .replace(i ,strlen("abc") ,"XYZ") ;
|
XYZdefXYZ
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|
Replace all instances of 'X','Y','Z' with 'A','B','C' respectively
|
a="XXXYYYZZZ";
|
replace(a .begin() ,a .end() ,'X' ,'A') ; replace(a .begin() ,a .end() ,'Y' ,'B') ; replace(a .begin() ,a.end(),'Z','C');
|
AAABBBCCC
|
Remove
|
Remove 1st instance of char 'X'
|
a="XXXYYYZZZ";
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if ((i=a .find('X'))!=string::npos) a .erase(i ,1) ;
|
XXYYYZZZ
|
|
Remove all instances of char 'X'
|
a="XXXYYYZZZ";
|
while ((i=a .find('X'))!=string::npos) a .erase(i ,1) ;
|
YYYZZZ
|
|
Remove 1st instance of substring 'abc'
|
a="abcdefabc";
|
if ((i=a .find("abc"))!=string::npos) a .erase(i ,strlen("abc")) ;
|
defabc
|
|
Remove all instances of substring 'abc'
|
a="abcdefabc";
|
while ((i=a .find("abc"))!=string::npos) a .erase(i ,strlen("abc")) ;
|
def
|
Remove by index
|
Remove 1st char
|
a="abcdef";
|
a.erase(0,1);
|
bcdef
|
|
Remove last char
|
a="abcdefghi";
|
a.erase(a.length()-1,1);
|
abcdefgh
|
|
Remove char at index 'n'
|
a="abcdef";
n=3;
|
a.erase(n,1);
|
abcef
|
|
Remove chars in index range 'm' to 'n' (inclusive)
|
a="abcdef";
m=2;
n=4;
|
a.erase(m,n-m+1);
|
abf
|
|
Remove chars from index 'n' onwards (inclusive)
|
a="abcdefghi";
n=3;
|
a.erase(3);
|
abc
|
|
Remove chars up to index 'n' (inclusive)
|
a="abcdefghi";
n=3;
|
a.erase(0,n+1);
|
efghi
|
Trim
|
Trim leading white space
|
a=" abc def ";
|
a=a .substr(a .find_first_not_of(' ')) ;
|
abc def
|
|
Trim trailing white space
|
a=" abc def ";
|
a=a .substr(0 ,a .find_last_not_of(' ') +1);
|
abc def
|
|
Trim leading and trailing white space
|
a=" abc def ";
|
a=a .substr(a .find_first_not_of(' '), a.find_last_not_of(' ') - a.find_first_not_of(' ') + 1);
|
abc def
|
|
Trim trailing carriage return
|
a="abcdef\n";
|
if (a.length() > 0 && a[a.length()-1]=='\n') a.erase(a.length()-1,1);
|
abcdef
|
Sort
|
Sort in ascending order
|
a="cafdeb";
|
sort(a.begin(),a.end());
|
abcdef
|
|
Sort in descending order
|
a="cafdeb";
|
sort(a .begin() ,a .end()) ; reverse(a .begin(),a.end());
|
fedcba
|
|
Reverse
|
a="abcdefghi";
|
reverse(a .begin(),a.end());
|
ihgfedcba
|
Convert case
|
Convert to lower case
|
a="ABCDEFGHI";
|
transform(a .begin() ,a .end() ,a.begin(),tolower);
|
abcdefghi
|
|
Convert to upper case
|
a="abcdefghi";
|
transform(a .begin() ,a .end() ,a.begin(),toupper);
|
ABCDEFGHI
|
|
Convert first char to lower case
|
a="ABCDEFGHI";
|
transform(a .begin() ,a .begin() +1,a.begin(),tolower);
|
aBCDEFGHI
|
|
Convert first char to upper case
|
a="abcdefghi";
|
transform(a .begin() ,a .begin() +1,a.begin(),toupper);
|
Abcdefghi
|
|
