58 lines
1.5 KiB
Markdown
58 lines
1.5 KiB
Markdown
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# StringSubstr
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Extracts a substring from a text string starting from the specified position.
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```
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string StringSubstr(
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string string_value, // string
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int start_pos, // position to start with
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int length=-1 // length of extracted string
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);
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```
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Parameters
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string_value
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[in] String to extract a substring from.
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start_pos
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[in] Initial position of a substring. Can be from 0 to [StringLen](/en/docs/strings/stringlen)(text) -1.
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length=-1
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[in] Length of an extracted substring. If the parameter value is equal to -1 or parameter isn't set, the substring will be extracted from the indicated position till the string end.
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Return Value
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Copy of a extracted substring, if possible. Otherwise returns an empty string.
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Example:
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```
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void OnStart()
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{
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//--- get the name of the current symbol
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string name = Symbol();
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//--- get the base and quoted symbol currencies
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string base = StringSubstr(name, 0, 3);
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string quoted = StringSubstr(name, 3, 3);
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//--- display the obtained symbol currencies in the log
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PrintFormat("Symbol: %s. Currency base: %s, currency quoted: %s", name, base, quoted);
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/*
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Result
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Symbol: EURUSD. Currency base: EUR, currency quoted: USD
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*/
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}
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```
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See also
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[StringSplit](/en/docs/strings/stringsplit), [StringFind](/en/docs/strings/stringfind), [StringGetCharacter](/en/docs/strings/stringgetcharacter)
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