Regular Expressions 101

^start of line

Character Class[a-zA-Z]

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

Character Class[a-zA-Z0-9]*

*matches any number of characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

^[a-zA-Z][a-zA-Z0-9]*$

New

foobarbaztxt
C:\FOO\BAR\BAZ.TXT
CFoOBaRBaZTxT
C:\FoO\BaR\test\BaZ.TxT
and so on.

Expression should match "foo\bar".

C:\FOO\\\BAR\BAZ.TXT
C:\FOO\\BAZ.TXT