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How can you set a regular expression to match regardless of case?

How can you set a regular expression to match regardless of case?

If you want only part of the regex to be case insensitive (as my original answer presumed), then you have two options:

  1. Use the (?i) and [optionally] (?-i) mode modifiers: (?i)G[a-b](?-i).*
  2. Put all the variations (i.e. lowercase and uppercase) in the regex – useful if mode modifiers are not supported: [gG][a-bA-B].*

What is the syntax to define a regular expression?

A regular expression pattern is composed of simple characters, such as /abc/ , or a combination of simple and special characters, such as /ab*c/ or /Chapter (\d+)\. \d*/ . The last example includes parentheses, which are used as a memory device.

What does the following regular expression match /[ A za Z ][ a za z ]*/?

Using character sets For example, the regular expression “[ A-Za-z] ” specifies to match any single uppercase or lowercase letter. In the character set, a hyphen indicates a range of characters, for example [A-Z] will match any one capital letter.

How do you match a character in C#?

Here are some of the more usual ones.

  1. ^ => It is used to match the beginning of a string.
  2. $=> It is used to match the end of a string.
  3. (Dot) => Matches any character only once.
  4. \d => It is used to match a digit character.
  5. \D => It is used to match any non-digit character.

How do you match a string in C#?

RegularExpressions; Regex regex = new Regex(“Net. *Amount”); String s = “Net Amount”; Match m = emailregex. Match(s); // Now you have information in m about the matching string.

What is the syntax to define a regular expression in JavaScript?

In JavaScript, a Regular Expression (RegEx) is an object that describes a sequence of characters used for defining a search pattern. For example, /^a…s$/ The above code defines a RegEx pattern. The pattern is: any five letter string starting with a and ending with s .

What does \Z mean in regex?

\Z is same as $ , it matches the end of the string, the end of the string can be followed by a line break. \z matches the end of the string, can’t be followed by line break.

How do you know if a regular expression matches a string?

When a string is in the set described by a regular expression, we often say that the regular expression matches the string. The simplest regular expression is a single literal character. Except for the metacharacters like \\*+? ()|, characters match themselves.

How do you write a regular expression in syntax?

Syntax for Regular Expressions. To create a regular expression, you must use specific syntax—that is, special characters and construction rules. For example, the following is a simple regular expression that matches any 10-digit telephone number, in the pattern nnn-nnn-nnnn: \\d {3}-\\d {3}-\\d {4}.

How to use regexp_match () syntax?

REGEXP_MATCH(name, ‘[a-zA-Z].*’) Syntax REGEXP_MATCH(X, regular_expression) Parameters X- a field or expression to evaluate. regular_expression- a regular expression. Returns The REGEXP_MATCHfunction returns booleanvalues. Notes REGEXP_MATCHattempts to match the entire string contained in field_expression.

How do you concatenate two regular expressions?

Two regular expressions can be altered or concatenated to form a new regular expression: if e1 matches s and e2 matches t, then e1 | e2 matches s or t, and e1 e2 matches st.