Regular Expression Reference
1) Write a regular expression to match pattern in email.
e.g match -eu before @ in email.
Regex : /.*-eu@gmail.com/g
2) Meta Character Reference
| Meta Char | Definition | Pattern | Sample Matches |
| ^ | Start of a string. | ^abc | abc, abcdefg, abc123, ... |
| $ | End of a string. | abc$ | abc, endsinabc, 123abc, ... |
| | | Alternation. | bill|ted | ted, bill |
| {...} | Explicit quantifier notation. | ab{2}c | abbc |
| [...] | Explicit set of characters to match. | a[bB]c | abc, aBc |
| (...) | Logical grouping of part of an expression. | (abc){2} | abcabc |
| * | 0 or more of previous expression. | ab*c | ac, abc, abbc, abbbc, ... |
| + | 1 or more of previous expression. | ab+c | abc, abbc, abbbc, ... |
| ? | 0 or 1 of previous expression; also forces minimal matching when an expression might match several strings within a search string. | ab?c | ac, abc |
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