MQL4参考 
MQL5 特色 MQL5 functions String Functions
String Functions
This is a group of functions intended for working with data of the string type.
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StringAdd
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Adds a string to the end of another string
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StringBufferLen
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Returns the size of buffer allocated for the string
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StringCompare
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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
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StringConcatenate
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Forms a string of parameters passed
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StringFill
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Fills out a specified string by selected symbols
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StringFind
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Search for a substring in a string
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StringGetCharacter
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Returns the value of a number located in the specified string position
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StringInit
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Initializes string by specified symbols and provides the specified string length
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StringLen
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Returns the number of symbols in a string
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StringSetLength
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Sets a specified length (in characters) for a string
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StringReplace
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Replaces all the found substrings of a string by a set sequence of symbols
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StringReserve
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Reserves the buffer of a specified size for a string in memory.
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StringSetCharacter
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Returns a copy of a string with a changed value of a symbol in a specified position
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StringSplit
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Gets substrings by a specified separator from the specified string, returns the number of substrings obtained
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StringSubstr
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Extracts a substring from a text string starting from a specified position
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StringToLower
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Transforms all symbols of a selected string to lowercase
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StringToUpper
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Transforms all symbols of a selected string into capitals
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StringTrimLeft
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Cuts line feed characters, spaces and tabs in the left part of the string
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StringTrimRight
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Cuts line feed characters, spaces and tabs in the right part of the string
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