I am trying to figure out a regular expression that matches a . (period). I looked for a formula but there was no formula that matches period.
12903,03930.
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This is addressed in the [StackOverflow Regular Expression FAQ](http://stackoverflow.com/a/22944075/2736496) under "Other", about 1/2 to 2/3 down. Relevant answers: [What special characters must be escaped?](http://stackoverflow.com/q/399078), [`[.]`:literal dot character](http://stackoverflow.com/a/21929764) – aliteralmind Apr 09 '14 at 02:04
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Thank you, I will check them out. – user3466687 Apr 09 '14 at 02:14
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You just need to escape the . as it's normally a meta character. The escape character is a backslash:
\.
E.g:
/[0-9]+\./
Will match a number followed by a period.
If you wanted to match the entire number except the period, you could do this:
/([0-9,]+)/
Here we use the range operator to select all numbers or a comma, 1 or more times.
Brandon
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I've updated my answer to demonstrate matching everything but the period – Brandon Apr 09 '14 at 01:54
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Thank you for editing and explanation. if I want to match only the end of digit, it should be /([0-9$]+)/ ? and first /([0-9^]+)/? – user3466687 Apr 09 '14 at 02:00
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Nope, it would be `/^[0-9]/` for the first digit, and `/[0-9]$/` for the last digit. The ^ and $ operators do different things when inside the range operator (`[]`) – Brandon Apr 09 '14 at 02:01
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() and [] confuses me. I want to check that theses are Regex for JavaScript Python, and grep? – user3466687 Apr 09 '14 at 02:17