String Functions

List of Functions:

string addslashes (string str)

Returns a string with backslashes before characters that need to be escaped. These characters are double quote ("), backslash (\), tabulation symbol (\t), new line symbol (\n), carriage return symbol (\r).

Arguments

string str - String to be escaped.

Return value

Escaped string.

int crc32 (string string)

Returns a control sum for a given string.

Arguments

string string - String to calculate a control sum for.

Return value

Control sum.

Variable extension (string str)

Returns an extension of a given file.

Arguments

string str - File name (or a full path to it) with the extension.

Return value

File extension.

Variable extension (string str, string ext)

Changes file extension to the specified one.

Arguments

string str - File name or path.
string ext - Extension to be set.

Return value

New file name or file path.

string format (string str, ... )

Returns a string produced according to the formatting string. The formatting string is composed of zero or more ordinary characters (excluding %) that are copied directly to the result string and control sequences, each of which results in fetching its own parameter. Each control sequence consists of a percent sign (%) followed by one or more of these elements, in order:

An optional number, a width specifier, that says how many characters (minimum) this conversion should result in.
An optional precision specifier that says how many decimal digits should be displayed for floating-point numbers.
A type specifier that says what type the argument data should be treated as. Possible types:
- c: the argument is treated as an integer and presented as a character with that ASCII value.
- d or i: the argument is treated as an integer and presented as a (signed) decimal number.
- o: the argument is treated as an integer and presented as an octal number.
- u: the argument is treated as an integer and presented as an unsigned decimal number.
- x: the argument is treated as an integer and presented as a hexadecimal number (with lowercase letters).
- X: the argument is treated as an integer and presented as a hexadecimal number (with uppercase letters).
- f: the argument is treated as a float and presented as a floating-point number.
- g: the same as e or f, the shortest one is selected.
- G: the same as E or F, the shortest one is selected.
- e: the argument is treated as using the scientific notation with lowercase 'e' (e.g. 1.2e+2).
- E: the argument is treated as using the scientific notation with uppercase 'E' (e.g. 1.2E+2).
- s: the argument is treated as and presented as a string.
- p: the argument is treated as and presented as a pointer address.
- %: a literal percent character. No argument is required.

Arguments

string str - Formatting string.
... - Arguments, multiple allowed.

Return value

A formatted string.

Examples

Source code (UnigineScript)

string str = format("string: %s, int: %d and float: %.4e","some words",10, 1.2e-2);
// str now is "string: some words, int: 10 and float: 1.2000e-02"

string lower (string str)

Makes a string lowercase.

Arguments

string str - String to modify.

Return value

Input string with all alphabetic characters converted to lowercase.

int match (string pattern, string str)

Simple string matching, which is faster than RegExp-based ones. Some wildcards are supported in the pattern:

?: any single symbol.
*: any string of arbitrary length.
|: OR statement; e.g.: "red|white" pattern matchs both "red" and "white" strings.

Arguments

string pattern - A pattern.
string str - A target string.

Return value

1 if match is found, 0 otherwise.

Variable memory (int size)

Converts a given number of bytes to KB (kilobytes), MB (megabytes) or GB (gigabytes) and represents them as a string.

Arguments

int size - Number of bytes.

Return value

The result of conversion. If the size value is less that 1024, it won't be converted.

Examples

Source code (UnigineScript)

log.message("The result is: %s\n",memory(2048)); 

// The result is: 2.0 KB

void printf (string str, ... )

Prints a formatted string. See the formatting string description.

Arguments

string str - Formatting string.
... - Arguments, multiple allowed.

int re_match (string str, string regexp)

Performs a regular expression match. See the RegExp class documentation for more information on the syntax of regular expressions.

Notice

This function is an analog of the RegExp.match() method.

Arguments

string str - String to search in.
string regexp - Pattern.

Return value

Length of the matched part, or -1, if the pattern could not be matched, and -2, if an error is encountered.

string re_replace (string str, string regexp, string after)

Performs a regular expression search and replace. See the RegExp class documentation for more information on the syntax of regular expressions.

Notice

This function is an analog of the RegExp.replace() method.

Arguments

string str - String to modify.
string regexp - Pattern.
string after - Replacement.

Return value

Modified string.

int re_search (string str, string regexp, int id = [])

Searches for a sub-string matching a given regular expression and returns a set of matches. See the RegExp class documentation for more information on the syntax of regular expressions.

Notice

This function is an analog of the RegExp.search() method.

Arguments

string str - String to search in.
string regexp - Pattern.
int id - Reference to a vector.

Return value

Size of a vector with matches.

string replace (string str, string before, string after)

Replaces all occurrences of a search string with a replacement string. If you don't need advanced replacing rules (like regular expressions), use this function instead of re_replace().

Arguments

string str - String to modify.
string before - Search string.
string after - Replacement sub-string.

Return value

A string with replaced fragments.

int sscanf (string str, string format, int id = [])

Parses a string according to a format. See the formatting string description.

Arguments

string str - String to parse.
string format - Formatting string.
int id - Reference to a vector.

Return value

Size of a vector with parsed objects.

Examples

Source code (UnigineScript)

int res[10];
printf("%d\n",sscanf("10 20.32 string","%d %f %s",res));
printf("%s\n%s\n%s\n",typeinfo(res[0]),typeinfo(res[1]),typeinfo(res[2]));

Output

3
int: 10
float: 20.32
string: "string"

int strchr (string str, int c)

Finds the first occurrence of a given character in a string.

Arguments

string str - String to search in.
int c - Character to search for.

Return value

Position of the first character occurrence.

int strcmp (string s0, string s1)

Binary-safe string comparison.

Arguments

string s0 - First string.
string s1 - Second string.

Return value

0 if compared strings are the same.
-1 if the first different character in s0 is less than that in s1.
1 if the first different character in s0 is greater than that in s1.

Examples

Source code (UnigineScript)

string s0 = "abcd";
string s1 = "abaa";

int result = strcmp(s0, s1);

if(result == 0) {
    log.message("The strings are the same!");
} else {
    log.message("Comparison result: %d\n", result);
}

Output

Comparison result: 1

string stripslashes (string str)

Un-escapes a string quoted with addslashes().

Arguments

string str - String to be un-escaped.

Return value

Un-escaped string.

int strlen (string str)

Gets a string length. (For UTF-8 encoded string, see utf8strlen() method.)

Arguments

string str - String to measure.

Return value

Length of the given string.

int strncmp (string s0, string s1, int n)

Binary-safe string comparison of the first n characters.

Arguments

string s0 - First string.
string s1 - Second string.
int n - Number of characters to compare.

Return value

0 if compared substrings are the same.
Negative value if the first different character in s0 is less than that in s1.
Positive value if the first different character in s0 is greater than that in s1.

Examples

Source code (UnigineScript)

string s0 = "abcd";
string s1 = "abacus";

int result = strncmp(s0, s1, 4);

if(result == 0) {
    log.message("The substrings are the same!");
} else {
    log.message("Comparison result: %d\n", result);
}

Output

Comparison result: 2

int strrchr (string str, int c)

Finds the last occurrence of a given character in a string.

Arguments

string str - String to search in.
int c - Character to search for.

Return value

Position of the last character occurrence.

int strrstr (string s0, string s1)

Searches the last occurence of a given sub-string in a string.

Arguments

string s0 - String to search in.
string s1 - Sub-string to search for.

Return value

Position of the last occurrence of the needle in the haystack.

int strsplit (string str, string delimiters, int id = [])

Splits a string into a vector.

Arguments

string str - String to split.
string delimiters - List of delimiters. If an empty string is passed, " \t\n\r" will be used by default.
int id - Reference to a vector.

Return value

Size of a vector with string parts.

int strstr (string haystack, string needle)

Searches a given sub-string in a string.

Arguments

string haystack - String to search in.
string needle - Sub-string to search for.

Return value

Position of the first occurrence of the needle in the haystack.

string substr (string str, int pos, int len = -1)

Returns a specified part of a string. (For UTF-8 encoded string, see utf8substr() method.)

Arguments

string str - String to truncate.
int pos - Starting position of a sub-string.
int len - Sub-string length.

Return value

A sub-string.

string trim (string str, string symbols = 0)

Removes from the string the specified leading and trailing characters.

NoticeIf no symbols are passed as an argument, white-space characters will be removed in the beginning or the end of the string, if found.

Arguments

string str - String to remove symbols from.
string symbols - Symbols to be removed from the beginning or the end of the string.

Return value

Trimmed string.

Examples

Source code (UnigineScript)

string s = "a b cd b b d b ab bba";
log.message("%s\n",trim(s," ab"));

Output

cd b b d

Variable unicodeToUtf8 (int src = [])

Converts an array of Unicode characters into the UTF-8 encoded string.

Arguments

int src - Source array ID.

Return value

UTF-8 string.

string upper (string str)

Makes a string uppercase.

Arguments

string str - String to modify.

Return value

Input string with all alphabetic characters converted to uppercase.

Variable utf8ToUnicode (string src, int size = [])

Converts an encoded UTF-8 string into the array of Unicode characters.

Arguments

string src - Source string.
int size - Return array ID.

Return value

Unicode encoded character array.

Variable utf8strlen (string str)

Gets a length of the string in UTF-8 encoding. Unlike a simple strlen() method, it returns the correct number of UTF-8 encoded characters.

Arguments

string str - String to measure.

Return value

Length of the given string.

Variable utf8substr (string str, int pos, int len = -1)

Returns a specified part of a string in UTF-8 encoding. Unlike a simple substr() method, it correctly counts UTF-8 encoded characters.

Arguments

string str - String to truncate.
int pos - Starting position of a sub-string.
int len - Sub-string length.

Return value

A sub-string.

Last update: 03.07.2017

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