That is, it matches any string with at least one character that is beyond the range of a to d. [^0-9] matches all non-digit characters. [^a-z] matches all non-letter characters. [^z-a] is an invalid pattern string. Unless otherwise specified, all the characters in the preceding ...
Matches one occurrence of char. For example, regular expression a specifies that any line containing the string a should be selected. . Matches one occurrence of any character. For example, regular expression . specifies that any line containing at least one character should be selected. \anychar...
Table 1. Regular expression metacharacters SymbolDescription .The period symbol matches any one character except the terminal newline character. [character–character]The hyphen symbol, within square brackets, means “through.” It fills in the intervening characters according to the current collating seq...
Dot (period) character \. com or net (com|net) Assembling these patterns into one character vector gives you the complete expression: email = '[a-z_]+@[a-z]+\.(com|net)'; Step 3 — Call the Appropriate Search Function In this step, you use the regular expression derived in Step...
For more information, see Negative character group. [^abc] be[^n-t] matches "bef" in "before", "beh" in "behind", and "bel" in "below", but finds no matches in "beneath" Match either the expression before or the one after the symbol | (sponge|mud) bath matches "sponge bath" ...
Pause for a moment. While worrying about the features and how they work, you might have missed what just happened. I started with a regular expression; now I have a grammar! I can define tokens and recurse. I have one more feature to show before I can get to the really good example....
The regular expression used in the preceding code example constrains an input name field to alphabetic characters (lowercase and uppercase), space characters, the single quotation mark (or apostrophe) for names such as O'Dell, and the period or dot character. In addition, the field length is ...
<substitute>: A regex substitution expression to replace matches found in the input string. The<original>and<substitute>operands are subject to rules of the regular expression engine such as character escaping or substitution expressions. The replacement pattern can consist of one or more substitutions...
Interval--At Least Count You use the at-least-count interval operator to search for a specified number of occurrences, or more, of the preceding character or subexpression. For example, to find where 'a' occurs at least 3 times, you use the regular expression: ...
\drepresents matching numbers. To use the\character, you need to add another backslash. For example, the formulaREGEXP(String,"\d")is invalid and needs to be changed toREGEXP(String,"\\d"), as shown in the following figure. *represents matching the preceding sub-expression for zero or ...