string1 = xxx-xx-xxxx or string1 = xx-xxxxxxx How can I make the regex accept both kinds of values for the same element? The x's represent numbers only. so total number of digits = 9 (anything between 0-9) total number of elements in the value is either 11 or 10... depending on which format. and total number of dashes is either 2 or 1.
Interactive periodic table with up-to-date element property data collected from authoritative sources. Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game!
The PubChem Periodic Table and Element pages help users navigate the abundant chemical element data available within PubChem while providing a convenient entry point to explore additional information, such as bioactivities and health and safety data, available in PubChem Compound pages for specific elements and their isotopes.
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You use these when you refer to something which you expect the person you are talking to to know about, or when you are checking that you are both thinking of the same person or thing.
This and these are demonstratives, which means they indicate a specific noun in a sentence. The two words are similar because they refer to nouns that are near in space and time.