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How do I find out if first character of a string is a number?
... && c <= '9');
Or the slower regex solutions:
s.substring(0, 1).matches("\\d")
// or the equivalent
s.substring(0, 1).matches("[0-9]")
However, with any of these methods, you must first be sure that the string isn't empty. If it is, charAt(0) and substring(0, 1) will throw a StringIn...
What is a regular expression for a MAC Address?
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C++ preprocessor __VA_ARGS__ number of arguments
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What are best practices for validating email addresses on iOS 2.0
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remove None value from a list without removing the 0 value
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RegEx - Match Numbers of Variable Length
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135
{[0-9]+:[0-9]+}
try adding plus(es)
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Regular expressions in C: examples?
...s):
#include <regex.h>
regex_t regex;
int reti;
char msgbuf[100];
/* Compile regular expression */
reti = regcomp(&regex, "^a[[:alnum:]]", 0);
if (reti) {
fprintf(stderr, "Could not compile regex\n");
exit(1);
}
/* Execute regular expression */
reti = regexec(&regex,...
Difference between declaring variables before or in loop?
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edited May 25 '17 at 7:52
Sunil Kanzar
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a...
Maintain aspect ratio of div but fill screen width and height in CSS?
...ave a site to put together that has a fixed aspect ratio of approximately 16:9 landscape, like a video.
9 Answers
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How to drop rows of Pandas DataFrame whose value in a certain column is NaN
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