04-06-2019
Hello nag_sathi,
This is called "parameter expansion" see following from documentation.
Quote:
${parameter%word}
${parameter%%word}
The word is expanded to produce a pattern and matched according to the rules described below (see Pattern Matching). If the pattern matches If the pattern matches a trailing portion of the expanded value of parameter, then the result of the expansion is the value of parameter with the shortest matching pattern (the ‘%' case) or the longest matching pattern (the ‘%%' case) deleted. If parameter is ‘@' or ‘*', the pattern removal operation is applied to each positional parameter in turn, and the expansion is the resultant list. If parameter is an array variable subscripted with ‘@' or ‘*', the pattern removal operation is applied to each member of the array in turn, and the expansion is the resultant list
Here is the link for understanding parameter expansion too.
Shell Parameter Expansion (Bash Reference Manual)
I hope this helps.
Thanks,
R. Singh
These 2 Users Gave Thanks to RavinderSingh13 For This Post:
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LEARN ABOUT PHP
mb_ereg_replace
MB_EREG_REPLACE(3) 1 MB_EREG_REPLACE(3)
mb_ereg_replace - Replace regular expression with multibyte support
SYNOPSIS
string mb_ereg_replace (string $pattern, string $replacement, string $string, [string $option = "msr"])
DESCRIPTION
Scans $string for matches to $pattern, then replaces the matched text with $replacement
PARAMETERS
o $pattern
- The regular expression pattern. Multibyte characters may be used in $pattern.
o $replacement
- The replacement text.
o $string
- The string being checked.
o $option
- Matching condition can be set by $option parameter. If i is specified for this parameter, the case will be ignored. If x is
specified, white space will be ignored. If m is specified, match will be executed in multiline mode and line break will be
included in '.'. If p is specified, match will be executed in POSIX mode, line break will be considered as normal character. If e
is specified, $replacement string will be evaluated as PHP expression.
RETURN VALUES
The resultant string on success, or FALSE on error.
NOTES
Note
The internal encoding or the character encoding specified by mb_regex_encoding(3) will be used as the character encoding for this
function.
Warning
Never use the e modifier when working on untrusted input. No automatic escaping will happen (as known from preg_replace(3)). Not
taking care of this will most likely create remote code execution vulnerabilities in your application.
SEE ALSO
mb_regex_encoding(3), mb_eregi_replace(3).
PHP Documentation Group MB_EREG_REPLACE(3)