An Introduction to Regular Expressions

The Match Operator

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The multi-line and single-line modifiers.

mode	^ and $ anchors consider target as	dot
default mode single-line mode multi-line mode clean multi-line	a single string, without regard to newlines a single string, without regard to newlines multiple logical lines separated by newlines multiple logical lines separated by newlines	doesn't match newline matches all characters (unchanged from default) matches all characters