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RegularCommonly used pattern modifiers in expressions include i, g, m, s, x, e, etc. They can be used in combination.
Their functions are as follows:
//Modifier: i case-insensitive matching;
//Modifier: g represents global matching
//Modifier: m will characters The string is treated as multiple lines, and it can be matched no matter which line it is;
//Modifier: s treats the string as a single line, and the newline character is treated as an ordinary character;
//Modifier: x treats the pattern Blank spaces in are ignored;
//Modifier:A forces matching from the beginning of the target string;
//Modifier:D If $ is used to limit the ending character, no newline at the end is allowed;
// Modifier: U only matches the most recent string; does not match repeatedly;
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