Patterns can be anchored in four ways:
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/^regex/ matches regex at the beginning of the string only -- ^ has this special meaning only at the start of the regular expression
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/regex$/ matches regex at the end of the string only -- $ has this meaning only at the end of the regular expression
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\b matches a word boundary so that
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/Variable\b/ matches Variable but not Variables (in a character class, \b denotes a backspace)
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\B matches NOT a word boundary so that
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/Variable\B/ matches Variables but not Variable
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