EINECS号：EINECS = re.compile(r'^\d\d\d-\d\d\d-\d$')CAS = re.compile(r'^\d*-\d\d-\d$')分子式：FORMULA = re.compile(r'([A-Z][A-Za-z0-9]+\.?[A-Za-z0-9]+/?[A-Za-z0-9]+)')CAS号最后验证码的计算方法： For example, the CAS number of water is 7732-18-5: the checksum is calculated as (8×1 + 1×2 + 2×3 + 3×4 + 7×5 + 7×6) = 105; 105 mod 10 = 5. Chemical Elements symbols Expression ^((?-i)A[cglmrstu]|B[aehikr]?|C[adeflmorsu]?|D[bsy]|E[rsu]|F[emf]?|G[ade]|H[efgos]?|I[nk]?|Kr?|L[airu]|M[dgnot]|N[abdeiop]|Os?|P[abdmortu]?|R[abefghnu]|S[bcegimnr]?|T[abcehil]|U(u[bhopqst])?|V|W|Xe|Yb?|Z[nr])$ Description Chemical elements of the periodic table from 1 to 118. Matches Hg Non-Matches HE Author Rating: Not yet rated. Guy Bruneau   Title Test Details CAS Number Expression \b[1-9]{1}[0-9]{1,5}-\d{2}-\d\b Description This is a more robust regex for matching Chemical Abstract Service (CAS) Numbers. This distinguishes between CAS numbers and other identifiers (e.g. EC number). Matches 50-00-0 Non-Matches 200-001-8 Author Rating: Not yet rated. Jarlath   Title Test Find Chemical Elements symbols Expression ^((?-i)A[cglmrstu]|B[aehikr]?|C[adeflmorsu]?|D[bsy]|E[rsu]|F[emf]?|G[ade]|H[efgos]?|I[nk]?|Kr?|L[airu]|M[dgnot]|N[abdeiop]|Os?|P[abdmortu]?|R[abefghnu]|S[bcegimnr]?|T[abcehil]|U(u[bhopqst])?|V|W|Xe|Yb?|Z[nr])$ Description Chemical elements of the periodic table from 1 to 118. Matches Hg Non-Matches HE Author Rating: Not yet rated. Guy Bruneau Source    

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