Question 320999 in Javascript Question posted in
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Javascript – What does the $ sign do in regex?

It says that:

$ specifies a match at the end of a string

So why then is a match returned for c$ in the string abc? If c is the last character of the string, shouldn’t it be looking for what comes after c and not c itself, and therefore return null?

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2

Answers


  1. 0

    No. $ means the end of the string, not any characters before or after the end. Think of it as the boundary after the last character. c$ will match "abc" but not "cba".

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  2. 0

    So why then is a match returned for c$ in the string abc? If c is the last character of the string, shouldn’t it be looking for what comes after c and not c itself, and therefore return null?

    /c$/ will match any string ending with 'c', for example: 'c', 'abc', '1234c' but will not match 'c1','c '..

    Similarly, you have ^ which indicates a beginning of the string.
    /^c/ will match any string starting with 'c', for example: 'c', 'cab', 'crab'.. but will not match '1c', ' c'..

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