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skills/mql5/references/docs/09-strings/0627-strings.md
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# String Functions
This is a group of functions intended for working with data of the [string](/en/docs/basis/types/stringconst) type.
| Function | Action |
| --- | --- |
| StringAdd | Adds a string to the end of another string |
| StringBufferLen | Returns the size of buffer allocated for the string |
| StringCompare | Compares two strings and returns 1 if the first string is greater than the second; 0 - if the strings are equal; -1 (minus 1) - if the first string is less than the second one |
| StringConcatenate | Forms a string of parameters passed |
| StringFill | Fills out a specified string by selected symbols |
| StringFind | Search for a substring in a string |
| StringGetCharacter | Returns the value of a number located in the specified string position |
| StringInit | Initializes string by specified symbols and provides the specified string length |
| StringLen | Returns the number of symbols in a string |
| StringSetLength | Sets a specified length (in characters) for a string |
| StringReplace | Replaces all the found substrings of a string by a set sequence of symbols |
| StringReserve | Reserves the buffer of a specified size for a string in memory. |
| StringSetCharacter | Returns a copy of a string with a changed value of a symbol in a specified position |
| StringSplit | Gets substrings by a specified separator from the specified string, returns the number of substrings obtained |
| StringSubstr | Extracts a substring from a text string starting from a specified position |
| StringToLower | Transforms all symbols of a selected string to lowercase |
| StringToUpper | Transforms all symbols of a selected string into capitals |
| StringTrimLeft | Cuts line feed characters, spaces and tabs in the left part of the string |
| StringTrimRight | Cuts line feed characters, spaces and tabs in the right part of the string |