Tutorial by Topics: flags

Regular expression patterns are often used with modifiers (also called flags) that redefine regex behavior. Regex modifiers can be regular (e.g. /abc/i) and inline (or embedded) (e.g. (?i)abc). The most common modifiers are global, case-insensitive, multiline and dotall modifiers. However, regex flavors differ in the number of supported regex modifiers and their types.

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